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FOC | Family List | FOC Vol. 12 | Tiliaceae

6. Grewia Linnaeus, Sp. Pl. 2: 964. 1753.

扁担杆属 bian dan gan shu

Trees or shrubs. Branchlets usually stellate. Leaves alternate; stipule minute, caducous; petiole short; leaf blade basal veins 3-5, margin serrate or rarely lobed. Flowers bisexual, polygamous, or unisexual (plants monoecious), usually arranged in 3- to many-flowered cymes, solitary or fascicled, axillary or opposite leaves, rarely terminal. Peduncle and pedicel usually hairy. Bracts caducous. Sepals 5, yellow, white, or lilac, rarely brown, free, valvate, abaxially hairy, adaxially usually glabrous, rarely hairy. Petals 5, mostly yellow or white in Flora area, shorter than sepals; glands usually scalelike, borne on base of petals, margin usually villous. Androgynophore short, usually glabrous. Stamens many, free, irregular in length; anthers globose, dorsifixed, dehiscence longitudinal. Ovary 2-4-loculed; ovules 2-8 per locule; style simple; stigma swollen, peltate, entire or 2-4-lobed. Drupe usually with 2 or 4 drupelets. Endosperm copious; cotyledons flat.

About 90 species: tropical regions of Old World; 27 species (13 endemic) in China.

Grewia nitida Jussieu (Ann. Mus. Natl. Hist. Nat. 4: 90. 1804) could not be treated here because no material was seen by the authors.

Grewia salviifolia Linnaeus f. is the basionym of Alangium salviifolium (Linnaeus f.) Wangerin in the Alangiaceae (see Fl. China 13: 307. 2007).


1 Ovary and drupe globose, not lobed; drupelets 1 or 2 per fruit   (2)
+ Ovary and drupe obviously 2-4-lobed, lobes ± globose, each with 1 drupelet   (6)
       
2 (1) Climbing lianas; leaf blade oblong or lanceolate, base cordate, abaxially subglabrous.   5 G. kwangtungensis
+ Erect shrubs or trees; leaf blade broadly ovate-orbicular to ovate-oblong, base oblique or symmetrically rounded, abaxially tomentose, rarely glabrous   (3)
       
3 (2) Leaf blade base oblique   (4)
+ Leaf blade base symmetrical, rounded   (5)
       
4 (3) Leaf blade abaxially densely softly stellate tomentose; cymes in clusters of 1-3.   1 G. eriocarpa
+ Leaf blade abaxially sparsely pilose or subglabrous; cymes in clusters of 2-6.   4 G. tiliifolia
       
5 (3) Petiole 5-10 mm, leaf blade broadly ovate, 4.5-6 cm wide; drupe 6-8 mm in diam.   2 G. celtidifolia
+ Petiole 3-4 mm, leaf blade nearly orbicular, 7.5-10 cm wide; drupe 4-5 mm in diam.   3 G. yinkiangensis
       
6 (1) Leaf blade ovate, rhomboid, suborbicular, or obovate-elliptic, base oblique or symmetrical, lateral basal veins ascending beyond middle of blade   (7)
+ Leaf blade lanceolate or oblong, base always symmetrical, lateral basal veins reaching mid leaf only   (16)
       
7 (6) Leaf blade abaxially glabrescent or sparsely pilose, never tomentose   (8)
+ Leaf blade abaxially tomentose, coarsely hairy or pilose   (10)
       
8 (7) Leaf blade margin serrulate, leaf blade elliptic to obovate-elliptic or suborbicular.   7 G. biloba
+ Leaf blade margin serrate or irregularly serrate, leaf blade rhomboid, ovate, or elliptic   (9)
       
9 (8) Leaf blade 2-4.5 cm wide, rhomboid or ovate; branchlets rust-brown stellate tomentose.   6 G. rhombifolia
+ Leaf blade 1-2 cm wide, ovate or elliptic; branchlets sparsely stellate hairy.   8 G. piscatorum
       
10 (7) Leaf blade adaxially glabrous or softly hairy   (11)
+ Leaf blade adaxially coarsely hairy   (12)
       
11 (10) Leaf blade elliptic or ovate-elliptic, margin crenate, branchlets softly yellow tomentose.   9 G. angustisepala
+ Leaf blade oblong-lanceolate, margin denticulate; branchlets glabrescent.   27 G. multiflora
       
12 (10) Leaf blade longer than 10 cm, base regular   (13)
+ Leaf blade shorter than 10 cm, base regular or oblique   (14)
       
13 (12) Erect shrubs or small trees; leaf blade 21-28 cm.   10 G. permagna
+ Climbing shrubs; leaf blade 8-13 cm.   11 G. acuminata
       
14 (12) Leaf blade ovate-orbicular or elliptic, 2-3 cm wide.   7 G. biloba
+ Leaf orbicular or broadly ovate-orbicular, 4-9 cm wide   (15)
       
15 (14) Cymes many per axil; peduncle 3-6 mm; stigma 2-lobed.   12 G. abutilifolia
+ Cymes 1 or 2 per axil; peduncle ca. 10 mm; stigma 5-lobed.   13 G. urenifolia
       
16 (6) Old leaves abaxially subglabrous or sparsely hairy on veins, adaxially hairy only in vein axils at most   (17)
+ Old leaves abaxially tomentose or rough-hairy, adaxially hairy   (18)
       
17 (16) Leaf blade leathery; peduncle robust, with long hairs; petals 2.5-3 mm.   14 G. concolor
+ Leaf blade thinly leathery; peduncle slender, with short hairs; petals 4-5 mm.   15 G. macropetala
       
18 (16) Leaf blade broadly oblong, base broadly cuneate or obtuse on one side; petiole 7-9 mm.   25 G. henryi
+ Leaf blade lanceolate, oblong-lanceolate, triangular-lanceolate, or band-shaped, base rounded or slightly cordate, rarely obtuse; petiole 1-8 mm   (19)
       
19 (18) Leaf blade triangular-lanceolate, base wide.   16 G. sessiliflora
+ Leaf blade lanceolate, oblong-lanceolate, or band-shaped, base rounded and narrow   (20)
       
20 (19) Teeth on leaf blade margin irregular in size, leaf blade leathery, densely tomentose.   24 G. cuspidatoserrata
+ Teeth on leaf blade margin regular and similar in size, leaf blade papery or leathery, glabrous or sparsely to densely hairy   (21)
       
21 (20) Leaf blade band-shaped, 13-20 × 1-3 cm   (22)
+ Leaf blade lanceolate or oblong-lanceolate, 4-14 × 2-4 cm   (23)
       
22 (21) Cymes 1-3 per axil; stamens 20-30; leaf veinlets adaxially obscure.   23 G. falcata
+ Cymes 2 to several per axil; stamens 10-20; leaf veinlets adaxially prominent.   26 G. lacei
       
23 (21) Leaf blade abaxially gray-white appressed stellate pilose.   22 G. retusifolia
+ Leaf blade abaxially yellow-brown or gray-brown tomentose or coarsely hairy   (24)
       
24 (23) Leaf blade abaxially stellate pilose   (25)
+ Leaf blade abaxially thickly and softly or coarsely tomentose   (26)
       
25 (24) Leaf blade abaxially sparsely yellow stellate pilose.   21 G. brachypoda
+ Leaf blade abaxially densely white stellate pilose.   20 G. latiglandulosa
       
26 (24) Leaf blade coarsely yellow-brown tomentose; petiole 2-3 mm   19 G. hirsuta
+ Leaf blade softly gray-brown tomentose; petiole 3-8 mm   (27)
       
27 (26) Leaf blade leathery; petiole 3-5 mm.   17 G. chuniana
+ Leaf blade papery; petiole 5-8 mm.   18 G. oligandra

  • List of lower taxa


     

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