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Hydrocotyle heteromeria

(Waxweed pennywort)

Common Names

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Common Names in English:

Waxweed, Waxweed pennywort

Description

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Family Araliaceae

Trees or shrubs , sometimes woody vines with aerial roots , rarely perennial herbs, hermaphroditic , andromonoecious or dioecious, often with stellate indumentum or more rarely simple trichomes or bristles , with or without prickles, secretory canals present in most parts. Leaves alternate, rarely opposite (never in Chinese taxa), simple and often palmately lobed , palmately compound , or 1-3-pinnately compound , usually crowded toward apices of branches, base of petiole often broad and sheathing stem, stipules absent or forming a ligule or membranous border of petiole. Inflorescence terminal or pseudo-lateral (by delayed development), umbellate , compound-umbellate, racemose, racemose-umbellate, or racemose-paniculate, ultimate units usually umbels or heads , occasionally racemes or spikes, flowers rarely solitary; bracts usually present, often caducous , rarely foliaceous . Flowers bisexual or unisexual , actinomorphic . Pedicels often jointed below ovary and forming an articulation . Calyx absent or forming a low rim , sometimes undulate or with short teeth. Corolla of (3-) 5(-20) petals, free or rarely united , mostly valvate , sometimes imbricate. Stamens usually as many as and alternate with petals, sometimes numerous , distinct , inserted at edge of disk; anthers versatile, introrse , 2-celled (or 4-celled in some non-Chinese taxa), longitudinally dehiscent . Disk epigynous, often fleshy , slightly depressed to rounded or conic, sometimes confluent with styles. Ovary inferior (rarely secondarily superior in some non-Chinese taxa), (1 or) 2-10(to many) -carpellate; carpels united, with as many locules; ovules pendulous, 2 per locule, 1 abortive ; styles as many as carpels, free or partially united, erect or recurved, or fully united to form a column; stigmas terminal or decurrent on inner face of styles, or sessile on disk, circular to elliptic and radiating. Fruit a drupe or berry, terete or sometimes laterally compressed , occasionally vertically compressed , exocarp fleshy; pyrenes cartilaginous or membranous, often laterally compressed. Seeds 1 per pyrene, embryo small, endosperm uniform or ruminate .

About 50 genera and 1350 species: widespread in tropical and subtropical regions of both hemispheres, much less diverse in temperate areas; 23 genera (two endemic, one introduced ) and 180 species (82 endemic, seven introduced) in China.

Chinese genera of economic importance include Aralia, Eleutherococcus, Heteropanax, Panax, and Tetrapanax (medicinal), Hedera (ornamental ), Fatsia and Schefflera (medicinal and ornamental), and Kalopanax (timber) .

Recent phylogenetic studies (Plunkett and Lowry, Molec. Phylogen. Evol. 19: 259-276. 2001; Wen et al. , Syst. Bot. 26: 144-167. 2001; Chandler and Plunkett, Bot. J. Linn. Soc. 144: 123-147. 2004; Mitchell and Wen, Taxon 53: 29-41. 2004; Plunkett et al., S. Afr. J. Bot. 70: 371-381. 2004) have shown that Hydrocotyle Linnaeus belongs to Araliaceae, despite being traditionally included in Apiaceae (see Fl. China 14: 14-18. 2005) .

Diplopanax Handel-Mazzetti was at one time placed in Araliaceae but is now regarded as a member of Mastixiaceae (see Fl. China 14: 231-232. 2005) .[1]

Genus Hydrocotyle

Herbs perennial . Stem slender, creeping or decumbent , rooting at the nodes. Leaves petiolate ; petioles not sheathing ; stipules present, entire or parted to base , membranous; blade cordate, orbicular , or reniform . Inflorescence a simple umbel; umbels sometimes densely capitate; peduncles axillary , obsolete to much longer than leaves; bracts present or absent; pedicels very short or extended (best seen in fruiting material ). Flowers bisexual . Calyx teeth minute or obsolete. Petals white, greenish or yellow, valvate , ovate , spreading . Stylopodium conic to depressed . Fruit globose or ellipsoid , strongly flattened laterally, base cordate, dorsal surface rounded , glabrous (rarely with white hairs ) ; dorsal and lateral ribs usually conspicuous , slender, acute (rarely obsolete) ; vittae inconspicuous. Seed face plane to concave ; endocarp woody. Carpophore usually absent.

About 75(-100) species: tropical and temperate regions worldwide; 14 species (five endemic) in China.[2]

Habitat

Typically found at an altitude of 0 to 581 meters (0 to 1,906 feet).[3]

Taxonomy

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Similar Species

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Members of the genus Hydrocotyle

ZipcodeZoo has pages for 30 species, subspecies, varieties, forms, and cultivars in this genus:

H. americana (American Marshpennywort) · H. bonariensis (Coastal-Plain Penny-Wort) · H. bowlesioides (Large-Leaf Penny-Wort) · H. geraniifolia (Forest Pennywort) · H. heteromeria (Waxweed Pennywort) · H. hirsuta (Yerba De Clavo) · H. hirta (Hairy Pennywort) · H. javanica (Pennywort) · H. laxiflora (Stinking Pennywort) · H. leucocephala (Brazilian Pennywort) · H. leucocephala var. intermedia (Brazilian Pennywort) · H. moschata (Musky Marshpennywort) · H. novae-zeelandiae (Hydrocotyle) · H. prolifera (Whorled Marshpennywort) · H. pusilla (Tropical Marshpennywort) · H. ranunculoides (Bullseye) · H. siamica (Large Pennywort) · H. sibthorpioides (Lawn Marshpennywort) · H. sibthorpioides 'Crystal Confetti' (Pennywort) · H. tripartita (Australian Hydrocotyle) · H. umbellata (Many-Flowered Pennywort) · H. umbellata var. ambigua (Water Pennywort) · H. umbellata var. intermedia (Water Pennywort) · H. umbellata var. microphylla (Water Pennywort) · H. umbellata var. umbellulata (Water Pennywort) · H. verticillata (Marsh Pennywort) · H. verticillata var. fetherstoniana (Whorled Marsh Pennywort) · H. verticillata var. verticillata (Whorled Marsh Pennywort) · H. vulgaris (European Marsh Pennywor) · H. vulgaris var. verticillata (Marsh Pennywort)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal January 10, 2008:

Identifiers

Footnotes

  1. Qibai Xiang & Porter P. Lowry "Araliaceae". in Flora of China Vol. 13 Page 435. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. Sheh Meng-lan, Mark F. Watson, John F. M. Cannon "Hydrocotyle". in Flora of China Vol. 14 Page 14. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  3. Mean = 512.240 meters (1,680.577 feet), Standard Deviation = 177.150 based on 76 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 2014-11-20