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Taxonomy

Genera

Acer

At least 2,630 species and subspecies belong to the Genus Acer.

More info about the Genus Acer may be found here.

Aceras

Xenophrys aceras is a species of amphibian in the Megophryidae family. It is found in Indonesia, Malaysia, and Thailand. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montanes, and rivers. It is threatened by habitat loss. [more]

At least 26 species and subspecies belong to the Genus Aceras.

More info about the Genus Aceras may be found here.

Achillea

Perennials [subshrubs], 6-80 cm (usually rhizomatous, sometimes fibrous rooted or taprooted; usually aromatic). Stems 1(-4+, clustered), usually erect, branched mostly distally, glabrous or sparsely to densely lanate (hairs usually basifixed). Leaves basal (often withering before flowering) and cauline; alternate; petiolate or sessile (bases ± clasping) ; blades (cauline equaling basal or slightly smaller distally) linear to oblong-lanceolate, usually 1-2[-4]-pinnately lobed, ultimate margins entire, abaxial faces sparsely to densely lanate, adaxial faces glabrate to sparsely tomentose. Heads radiate [discoid], in compact to open (± flat-topped), simple or compound, corymbiform arrays [borne singly]. Involucres campanulate to hemispheric, mostly 2-3(-5+) mm diam. Phyllaries persistent, 10-30 in (1-) 2-3(-4) series, oblong, ovate, or oblanceolate to lanceolate (midribs conspicuous), unequal, margins and apices (pale to black) scarious. Receptacles usually flat to slightly convex, rarely conic, paleate; paleae membranous, ± folded (sometimes each with central resin duct). Ray florets [0] 3-5(-12+), usually pistillate and fertile; corollas usually white (laminae yellow at bases), sometimes pale yellow to pink or purple (tubes ± flattened), laminae orbiculate to suborbiculate (becoming reflexed). Disc florets usually (5-) 15-75+, rarely 0, bisexual, fertile; corollas white to grayish or yellowish [yellow, pink], tubes ± flattened (bases ± saccate, clasping apices of cypselae), throats ± campanulate, lobes 5, ± deltate. Cypselae obcompressed, oblong to obovate (margins sometimes winged, apices rounded) ; ribs usually 2, lateral (sometimes plus 1 adaxial), faces glabrous (pericarps with myxogenic cells, sometimes with resin sacs; embryo sac development monosporic). x = 9.^[1] [more]

At least 1,024 species and subspecies belong to the Genus Achillea.

More info about the Genus Achillea may be found here.

Achimenes

Achimenes is a genus of about 25 species of tropical and subtropical rhizomatous perennial herbs in the flowering plant family Gesneriaceae. They have a multitude of common names such as Magic Flowers, Widow's Tears, Cupid's Bower, or Hot Water Plant. The plant's name comes from the Greek word meaning "suffer from cold." [more]

At least 403 species and subspecies belong to the Genus Achimenes.

More info about the Genus Achimenes may be found here.

Acineta

Acineta, abbreviated as Acn in horticultural trade, is a small genus belonging to the orchid family (Orchidaceae). The name is derived from the Greek word 'akinetos' (immobile), referring to the rigid labellum (lip). [more]

At least 40 species and subspecies belong to the Genus Acineta.

More info about the Genus Acineta may be found here.

Acinos

Acinos is a genus of ten species of annual and short-lived evergreen perennial woody plants native to southern Europe and western Asia. Its name comes from the Greek word akinos, the name of a small aromatic plant. They are small, tufted, bushy or spreading plants growing to 10-45 cm tall. The 2-lipped, tubular flowers are borne on erect sprikes in mid-summer. [more]

At least 116 species and subspecies belong to the Genus Acinos.

More info about the Genus Acinos may be found here.

Acourtia

Perennials, (2.5-) 5-50(-150+) cm (caudices brown-woolly, aerial stems glabrate or resinous-punctate). Leaves basal, cauline, or both; shortly petiolate or sessile; blades elliptic-oblong, lanceolate, oblong, oblong-lanceolate, oblong-oblanceolate, orbiculate, ovate, ovate-elliptic, or rhombic-orbiculate (thin and chartaceous to thick and coriaceous), bases cuneate to cordate or clasping, margins entire or lobed or pinnately parted, dentate, or serrate, faces usually minutely stipitate-glandular and/or hirtellous. Heads quasi-radiate [discoid] (see florets), borne singly or in paniculiform or corymbiform arrays. Involucres turbinate or obconic to campanulate, 6-17+ mm. Phyllaries in 1-7 series, lanceolate to oblanceolate or linear, unequal (rigid, margins scarious), apices obtuse to acute, acuminate, or mucronate. Receptacles concave, flat, or convex, usually foveolate, alveolate, or reticulate, pubescent, sometimes paleate (paleae apically pubescent). Florets 3-25(-80), bisexual, fertile; corollas pink to lavender or white [yellow], zygomorphic (2-lipped; outer lip liguliform, 3-toothed, inner usually smaller, 2-lobed, lobes often curled) ; anther basal appendages entire, elongate, rounded, apical appendages lanceolate; style branches relatively short, apices blunt-penicillate (abaxial faces usually glabrous, i.e., without collecting hairs). Cypselae ± fusiform or terete to cylindric, 4-10 mm, not beaked, usually ± ribbed, faces glabrous or stipitate-glandular; pappi of 40-60(-80+) tan or white, ± barbellate to nearly smooth bristles in 1-3(-9) series. x = 27.^[2] [more]

At least 111 species and subspecies belong to the Genus Acourtia.

More info about the Genus Acourtia may be found here.

Adromischus

Adromischus is a genus of easily propagated leaf succulents from the Crassulaceae family. Adromischus are endemic to southern Africa. [more]

At least 117 species and subspecies belong to the Genus Adromischus.

More info about the Genus Adromischus may be found here.

Aesculus

Trees or shrubs, deciduous. Winter buds large, viscid resinous or not, with several pairs of imbricate scales; scales abaxially glabrous or sparsely puberulent. Leaf blade 5-11-foliolate; leaflet blades without scattered, conspicuous glands, margin crenate to serrate or compoundly so. Thyrse cylindric or conic; branches simple; bracts absent. Flowers often large and showy. Sepals connate to form a tubular to campanulate calyx tube. Petals often unequal, base clawed, limb obovate, oblong, oblanceolate, or spatulate. Ovary without a gynophore; style long, slender; stigma depressed globose, entire or obscurely lobed. Capsule depressed globose to pyriform, without a long gynophore, often 1-seeded; pericarp usually smooth, often dotted, rarely verrucose or prickly. Seeds depressed globose to pyriform, large (2-7 cm) ; testa brown; hilum large, pale, occupying 1/3-1/2 of seed. x = 20.^[3] [more]

At least 224 species and subspecies belong to the Genus Aesculus.

More info about the Genus Aesculus may be found here.

Ajuga

Plants annual, biennial or perennial, herbaceous, rarely shrubs. Leaves simple; leaf blade papery, margin dentate to incised, rarely subentire. Verticillasters 2- to many flowered, in false spikes; floral leaves similar to stem leaves or gradually reduced to bracts, rarely dissimilar, larger than stem leaves. Flowers subsessile. Calyx ovoid to globose, campanulate to funnelform, 10-veined, sometimes with inconspicuous accessory veins; teeth 5, slightly irregular. Corolla purple to blue, rarely yellow or white, 2-lipped, often persistent in fruit; tube straight to slightly curved, base slightly bent/swollen; throat slightly dilated, villous annulate, rarely glabrous inside; upper lip straight, entire to 2-lobed; lower lip elongate, 3-lobed, with middle lobe obcordate to nearly flabellate and lateral lobes oblong. Stamens 4, didynamous, exserted from upper lip, involute in bud, anterior 2 longer; filaments straight to slightly curved; anther cells 2, apically confluent. Style subequally 2-cleft, lobes subulate. Nutlets obovoid, triquetrous, netted on back, lateral-ventral side with an areole 1/2-2/3 its length, with an elaiosome.^[4] [more]

At least 356 species and subspecies belong to the Genus Ajuga.

More info about the Genus Ajuga may be found here.

Allium

Herbs, perennial, scapose, from tunicate bulbs, with onion odor and taste. Bulbs solitary or clustered, dividing at base, or on rhizomes, reforming annually; outer coats generally brown or gray, smooth, fibrous, or with cellular reticulation (generally important in identification) ; inner coats membranous. Leaves generally withering from tip by anthesis, usually persistent, 1-12, basal; blade usually linear, terete, channeled, or flat (carinate in A. sativum, A. praecox, A. tuberosum, A. rotundum, A. neapolitanum, A. triquetrum, A. unifolium, and A. lacunosum), straight or ± falcate (coiled or circinate in A. nevadense and A. atrorubens), broader in A. victorialis and A. tricoccum, not petiolate (except in A. tricoccum and A. victorialis) . Scape usually persistent, terete or flattened. Inflorescences umbellate, flowering centripetally (centrifugally in A. schoenoprasum), sometimes replaced totally or partially by bulbils, subtended by spathe bracts; bracts conspicuous, ± fused, usually 3+-veined, equaling pedicel except in some introduced species, membranous. Flowers erect (pendent in A. triquetrum) ; tepals 6, in 2 similar whorls, ± distinct, petallike, usually becoming becoming dry and persisting; stamens 6, epipetalous; filaments in all but 1 native species broad at base, fused into ring (some introduced species and A. victorialis appendaged), linear, generally glabrous (A. rotundum and A. hoffmanii papillose to ciliate proximally) ; anthers and pollen variously colored; ovary superior, 3-lobed, sometimes crested with processes, 3-locular, usually 2 ovules per locule (6-8 in A. nigrum), crest processes 3 or 6, smooth except in A. haematochiton, A. sharsmithiae, and A. lacunosum; style 1; stigma capitate to ± 3-lobed; pedicel erect or spreading (lax in A. triquetrum) . Fruits capsular, dehiscence loculicidal. Seeds black, obovoid, finely cellular-reticulate, cells smooth or minutely roughened, with 1-8 papillae, without caruncle except in A. triquetrum. x = 7, 8, 9.^[5] [more]

At least 2,758 species and subspecies belong to the Genus Allium.

More info about the Genus Allium may be found here.

Aloe

Plants succulent, shrubby or arborescent, scapose. Stems erect, clambering or ascending, branched or not. Leaves succulent, crowded, often rosulate or distichous; blade margins spiny-toothed or entire. Inflorescences axillary or terminal, paniculate to more often racemose, dense, bracteate. Flowers usually nodding; perianth red to yellow; tepals connate basally to almost entirely into tube; stamens 3 or 6; style slender; pedicel not articulate. Capsules papery to woody. x = 7.^[6] [more]

At least 1,200 species and subspecies belong to the Genus Aloe.

More info about the Genus Aloe may be found here.

Ambrosinia

More info about the Genus Ambrosinia may be found here.

Amorphophallus

Amorphophallus (from Ancient Greek amorphos, "without form, misshapen" + phallos, "penis") is a large genus of some 170 tropical and subtropical tuberous herbaceous plants from the Arum family (Araceae). [more]

At least 250 species and subspecies belong to the Genus Amorphophallus.

More info about the Genus Amorphophallus may be found here.

Ampelopsis

Lianas, woody, hermaphroditic or polygamo-monoecious. Tendrils 2- or 3-branched. Leaves simple, 1- or 2-pinnately or palmately compound. Inflorescence a corymbose cyme, leaf-opposed or pseudoterminal, often at tips of tendrils. Flowers 5-merous. Calyx saucer-shaped. Petals 5, free. Disk well developed, margin undulately lobed. Stamens 5. Style conspicuous; stigma inconspicuously expanded. Berry spherical, 1-4-seeded. Seed obovoid, base rostrate, apex rounded; cross-section of endosperm M-shaped.^[7] [more]

At least 152 species and subspecies belong to the Genus Ampelopsis.

More info about the Genus Ampelopsis may be found here.

Anacamptis

Anacamptis Rich., 1817 is a small genus from the orchid family (Orchidaceae). This genus is abbreviated as Ant. in trade journals. [more]

At least 100 species and subspecies belong to the Genus Anacamptis.

More info about the Genus Anacamptis may be found here.

Ananas

At least 81 species and subspecies belong to the Genus Ananas.

More info about the Genus Ananas may be found here.

Androsace

Herbs perennial, annual, or biennial, acaulescent, rarely caulescent with ascending or decumbent shoots from a caudex. Leaves forming a rosette, rarely alternate; rosettes solitary or clustered, forming lax mats or compact cushions. Inflorescences umbellate, rarely a solitary flower, with bracts. Flowers 5-merous, homostylous. Calyx campanulate to subglobose, shallowly to deeply lobed. Corolla white, pink, purple, or dark red, rarely yellow; tube usually ± inflated, ca. as long as to shorter than calyx; throat constricted; lobes entire or emarginate. Stamens included, inserted on corolla tube; filaments very short; anthers ovate, apex obtuse. Style not longer than corolla tube. Capsule subglobose, dehiscing nearly to base. Seeds few to many.^[8] [more]

At least 515 species and subspecies belong to the Genus Androsace.

More info about the Genus Androsace may be found here.

Anemanthele

Anemanthele is a monotypic genus of grass indigenous to New Zealand. Its only species is Anemanthele lessoniana, often called gossamer grass or New Zealand wind grass. This is a naturally rare grass in the wild but it is widely cultivated for use as an attractive ornamental garden plant. It is marginal in zone 8, going dormant and deciduous in cold winters, but usually an evergreen to semi-evergreen. Good green arching foliage to 3 feet in USDA 8, with highlights of orange, copper, and gold, especially in drier soils. Excellent backlit. [more]

At least 3 species and subspecies belong to the Genus Anemanthele.

More info about the Genus Anemanthele may be found here.

Angraecum

The genus Angraecum, abbreviated as Angcm in horticultural trade, common name Angrec or Comet Orchid, contains about 220 species, some of them among most magnificent of all orchids. They are quite varied vegetatively and florally and are adapted to dry tropical woodland habitat and have quite fleshy leaves as a consequence. Most are epiphytes, but a few are lithophytes. [more]

At least 588 species and subspecies belong to the Genus Angraecum.

More info about the Genus Angraecum may be found here.

Anthemis

Annuals (biennials) [perennials, subshrubs], mostly 5-90 cm (often aromatic). Stems 1-5+, erect to decumbent, usually branched, strigillose or strigoso-sericeous to villous (hairs medifixed), glabrescent [glabrous or sericeous to lanate]. Leaves mostly cauline; alternate; petiolate or sessile; blades ± obovate to spatulate, 1-3-pinnately lobed, ultimate margins dentate to lobed, faces glabrous or strigillose to villous [glabrous or sericeous to lanate]. Heads radiate [discoid], borne singly or in lax, corymbiform arrays (peduncles sometimes clavate and/or curved in fruit). Involucres obconic to hemispheric or broader, 5-13[-20] mm diam. Phyllaries persistent, mostly 21-35+ in 3-5 series, distinct, deltate to lanceolate, oblong, or elliptic, unequal, margins and apices (hyaline and colorless or brownish [black]) scarious. Receptacles hemispheric to narrowly conic, paleate (wholly or only distally) ; paleae ± flat, scarious to indurate (subulate or elliptic to obovate with mucronate to acuminate-spinose tips). Ray florets [0 or 2-]5-20[-30+], pistillate and fertile or styliferous and sterile; corollas usually white, rarely yellow or pink, laminae mostly oblong (tubes sometimes hairy). Disc florets (60-) 100-300+, bisexual, fertile; corollas usually yellow, rarely pink, tubes ± cylindric (usually proximally dilated, ± spongy in fruit, sometimes hairy, not saccate), throats funnelform, lobes 5, ± triangular (abaxially minutely crested). Cypselae obovoid to obconic or turbinate (circular or 4-angled in cross section), ribs usually 9-10 (0) and smooth or tuberculate, faces glabrous (pericarps with myxogenic cells) ; pappi 0 or coroniform. x = 9.^[9] [more]

At least 794 species and subspecies belong to the Genus Anthemis.

More info about the Genus Anthemis may be found here.

Arecastrum

At least 5 species and subspecies belong to the Genus Arecastrum.

More info about the Genus Arecastrum may be found here.