|
|
6. Helicteres Linnaeus, Sp. Pl. 2: 963. 1753.
山芝麻属 shan zhi ma shu
Trees or shrubs. Branches or branchlets ± stellate. Leaves simple, entire or serrate. Flowers bisexual, solitary or cymose, axillary or rarely terminate. Epicalyx lobes minute. Calyx tube-shaped, 5-lobed, lobes usually unequal and 2-lipped. Petals 5, equal to each other or 2-lipped, clawed and usually with auriculate appendage. Anthers 10, on top of elongate androgynophore; filaments ± connate, enclosing pistil; staminodes 5, within stamens. Ovary 5-celled, 5-angular; ovules numerous in each locule; styles 5, linear, apically slightly swollen. Mature capsule straight or spirally twisted, usually densely hairy, often with soft setae which are themselves hairy. Seeds verrucose.
About 60 species: tropical America and Asia; ten species (one endemic) in China.
|
|
1 |
Capsule spirally twisted, not setose; inflorescences several per axil, densely clustered; leaf blade broadly oblong-obovate, apex somewhat truncate and usually lobed. |
|
1 H. isora |
+ |
Capsule not twisted, sparsely to densely softly setose; inflorescences 1 per axil, often spikelike or with subtending leaves very reduced to form a terminal thyrse; leaf blade usually narrower, apex not truncate, often not lobed |
|
(2) |
|
|
|
|
2 (1) |
Leaf blade margin entire or rarely with a few minute teeth near apex |
|
(3) |
+ |
Leaf blade margin obviously serrate or dentate from base |
|
(6) |
|
|
|
|
3 (2) |
Capsule apex obtuse; petiole ca. 12 mm, leaf blade 6-10 cm, apex obtuse. |
|
2 H. obtusa |
+ |
Capsule apex pointed or beaked; petiole 3-9 mm, leaf blade 3.5-7.5 cm, apex usually acuminate, acute or obtuse with acumen (obtuse in H. prostrata) |
|
(4) |
|
|
|
|
4 (3) |
Subshrubs to 0.45 m tall, stems prostrate; leaf blade 2-3.5 cm. |
|
10 H. prostrata |
+ |
Shrubs 1-2 m tall, stems erect or ascending; leaf blade 3.5-7.5 cm |
|
(5) |
|
|
|
|
5 (4) |
Branchlets pilose with gray-green hairs; leaf blade margin entire to apex; capsule with dense mixed stellate and long simple hairs. |
|
3 H. angustifolia |
+ |
Branchlets tomentose with yellow-brown hairs; leaf blade margin entire or denticulate near apex; capsule with dense long simple hairs. |
|
4 H. lanceolata |
|
|
|
|
6 (2) |
Calyx 12-18 mm; capsule 2.5-5 cm |
|
(7) |
+ |
Calyx 4-6 mm; capsule 1.5-2 cm |
|
(8) |
|
|
|
|
7 (6) |
Leaf blade margin lobed; petals white. |
|
8 H. viscida |
+ |
Leaf blade margin irregularly dentate; petals red or purplish red. |
|
9 H. hirsuta |
|
|
|
|
8 (6) |
Upper leaves of fertile shoots very reduced to a lax thyrse; petals yellow. |
|
5 H. elongata |
+ |
Upper leaves of fertile shoots not or only slightly reduced; petals red-purple or blue-purple |
|
(9) |
|
|
|
|
9 (8) |
Leaf blade abaxially sparsely stellate pilose; petals with central line of hairs; stipules as long as petiole. |
|
6 H. glabriuscula |
+ |
Leaf blade abaxially densely brown stellate tomentose; petals glabrous; stipules ca. 2 × as long as petiole. |
|
7 H. plebeja |
|
|
Lower Taxa
Related Links (opens in a new window) |
Treatments in Other Floras @ www.efloras.org
Other Databases
|
|
|
|
|
|
|