Tree from India, where it is grown for shade and for valuable timber similar to oak and teak.
Click on the language to view common names.
Common Names in English:
Bayur, Bayur Tree, Dinnerplate Tree, Maple Leaved Bayur, Mayeng, Pterospermum
Common Names in Hindi:
Common Names in Oriya:
, or less often trees
; indumentum usually with peltate scales
. Leaves alternate, stipulate
; leaf blade
usually palmately veined, entire or various lobed
. Flowers solitary, less often in small cymes or clusters
, often aggregated into terminal
or panicles, usually conspicuous
, usually bisexual
in Kydia) . Epicalyx
often present, forming an involucre around calyx, 3- to many lobed. Sepals 5, valvate
. Petals 5, free, contorted, or imbricate, basally adnate
. Stamens usually very many, filaments connate into tube; anthers
1-celled. Pollen spiny
. Ovary superior, with 2-25 carpels, often separating from one another and from axis; ovules 1 to many per locule; style as many or 2 Ã— as many as pistils, apex branched or capitate. Fruit a loculicidal capsule or a schizocarp, separating into individual mericarps, rarely berrylike when mature
(Malvaviscus) ; carpels sometimes with an endoglossum (a crosswise projection from back wall of carpel to make it almost completely septate
. Seeds often reniform
, sometimes conspicuously so.
About 100 genera and ca. 1000 species: tropical and temperate regions of N and S Hemisphere; 19 genera (four introduced ) and 81 species (24 endemic, 16 introduced) in China.
Molecular studies have shown that the members of the Bombacaceae, Malvaceae, Sterculiaceae, and Tiliaceae form a very well-defined monophyletic group that is divided into ten also rather well-defined clades, only two of which correspond to the traditional families Bombacaceae and Malvaceae. Some of the remaining groups are included entirely within either of the remaining families but others cut across the traditional divide between the Sterculiaceae and Tiliaceae. A majority of authors , most notably Bayer and Kubitzki (Fam. Gen. Vasc. Pl. 5: 225-311. 2003), has favored including everything within a greatly enlarged Malvaceae, and treating the individual clades as subfamilies. The alternative view is that the individual clades should be treated as a series of ten families: Bombacaceae (Bombacoideae), Brownlowiaceae (Brownlowioideae), Byttneriaceae (Byttnerioideae), Durionaceae (Durionoideae), Helicteraceae (Helicteroideae), Malvaceae (Malvoideae), Pentapetaceae (Dombeyoideae), Sparrmanniaceae (Grewioideae), Sterculiaceae (Sterculioideae), and Tiliaceae (Tilioideae) (Cheek in Heywood et al. , Fl. Pl. Fam. World. 201-202. 2007) . For the present treatment, we prefer to retain the familiar, traditional four families, so as to maintain continuity with the treatments in FRPS, and to await a consensus on the two alternative strategies for dealing with the very widely accepted clades.
The traditional Malvaceae coincides exactly with one of the major clades. The only possible problem is the relationship with the Bombacaceae, which also has primarily 1-loculed anthers, and some authorities have suggested that the Bombacaceae should be included within the Malvaceae.
Members of the Malvaceae are important as fiber crops (particularly cotton, Gossypium) . Young leaves of many species can be used as vegetables, and species of Abelmoschus and Hibiscus are grown as minor food crops. Many species have attractive flowers and an ever-increasing selection is grown as ornamentals . Several have been cultivated for a very long time, particularly species of Hibiscus, and some of these are not known in the wild.
. Leaves simple
; stipules linear
to palmately fimbriate, sometimes forming nectaries, caducous
short; leaf blade
or not, leathery, base
entire or serrate, apex sometimes truncate
; juvenile leaves sometimes much larger, petiole long, leaf blade often with peltate base and prominently palmately lobed. Inflorescence axillary
, 1-flowered or cymose
and 1-5-flowered. Flowers bisexual
usually 3, usually distant
from calyx, entire, fimbriate, or palmately lobed, rarely absent, caducous. Calyx 5(or 6) -lobed, divided
nearly to base, usually spreading
to ± reflexed
, caducous. Petals 5, white or yellow, often erect
present, very short, glabrous
. Stamens 15, in 5 groups of 3 alternating with staminodes; filaments
at top; anthers
; staminodes 5, filiform
and thicker than filaments. Ovary 5-locular; ovules 4-22 per locule; style clavate
or filiform; stigma longitudinally 5-grooved. Fruit a schizocarp, cylindric
, angular or rounded
, usually woody, sometimes leathery, dehiscent
into 5 loculicidal mericarps when mature
. Seeds 2 to many per locule, with long, oblong
, membranous wing
; endosperm scanty or absent; cotyledons usually plicate
, simple. 2n = 38.
Between 18 and 40 species: tropical and subtropical Asia; nine species (five endemic) in China.
Species Pterospermum acerifolium
Big trees ; bark smooth . Branchlets densely velutinous when young. Stipules linear ; petiole robust , striate ; leaf blade nearly orbicular or oblong , sometimes ± lobed , 24-34 × 14-29 cm, leathery, abaxially densely yellowish and gray stellate velutinous, adaxially sparsely hairy or glabrous , base cordate, margin entire or crenate, apex truncate , nearly rounded , or pointed ; juvenile leaves palmately lobed, peltate. Flowers solitary, fragrant; epicalyx lobes fimbriate or palmately divided. Sepals linear-oblong, ca. 9 × 0.7 cm, abaxially densely yellow-brown stellate velutinous, adaxially white villous . Petals white, linear-oblong, slightly cuneate, slightly shorter than sepals, glabrous. Staminodes clavate , hairy. Ovary oblong, 5-angular; ovules many per locule. Capsule woody, cylindrical, stipitate , obscurely 5-grooved, 10-15 × 5-5.5 cm, reddish brown velutinous, glabrescent , base tapering, apex rounded. Seeds many per locule, obliquely ovate , flat, wing large and thin, brown, smooth. [source]
Flowers: Flower Color: near white, white
Size: over 40' tall.
Forested slopes ; 1200-1700 m .
Culture: Space 15-20' apart.
Soil: Minimum pH: 6.1 • Maximum pH: 7.5
Sunlight: Sun Exposure: Sun to Partial Shade.
Temperature: Cold Hardiness: 10a, 10b, 11. (map)
- Chatton, 1925
- Haeckel, 1866
- Cavalier-Smith, 1981
- Sinnott, 1935 ex Cavalier-Smith, 1998
- Vascular Plants
- Kenrick & Crane, 1997, nom. inval.
- Kenrick & Crane, 1997
- Novák ex Takht. (1967)
- Novák ex Takhtajan, 1967
- Superorder: Rosanae () - Takhtajan, 1967
- Subclass: Magnoliidae () - Novák ex Takhtajan, 1967 - Angiosperms
- Class: Magnoliopsida () - Novák ex Takht. (1967) - Dicotyledons
- Infraphylum: Radiatopses () - Kenrick & Crane, 1997
- Subphylum: Euphyllophytina () - Kenrick & Crane, 1997, nom. inval.
- Phylum: Tracheophyta () - Sinnott, 1935 ex Cavalier-Smith, 1998 - Vascular Plants
- Subkingdom: Viridaeplantae () - Cavalier-Smith, 1981
- Kingdom: Plantae () - Haeckel, 1866 - Plants
Publishing author : Willd. Publication : Sp. Pl., ed. 4 [Willdenow] 3(1): 729 1800
Members of the genus Pterospermum
ZipcodeZoo has pages for 1 species, subspecies, varieties, forms, and cultivars in this genus:
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Accessed through GBIF Data Portal March 17, 2008:
- Herbarium of the University of Aarhus: The AAU Herbarium Database
- Biodiversity Heritage Library NamebankID: 5869551
- Global Biodiversity Information Facility Taxonkey: 15870456
- Globally Unique Identifier: urn:lsid:ipni.org:names:86494-3
- GRIN Nomen Number: 312952
- International Plant Names Index (IPNI) ID: 824741-1
- Zipcode Zoo Species Identifier: 606862
- Ya Tang, Michael G. Gilbert & Laurence J. Dorr "Malvaceae". in Flora of China Vol. 12 Page 240, 264,299, 302. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
- Ya Tang, Michael G. Gilbert & Laurence J. Dorr "Pterospermum". in Flora of China Vol. 12 Page 302, 303, 327. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
- "Pterospermum acerifolium". in Flora of China Vol. 12 Page 327, 328. Missouri Botanical Garden Press. Online at EFloras.org. [back]