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FOC | Family List | FOC Vol. 19 | Acanthaceae

2. Staurogyne Wallich, Pl. Asiat. Rar. 2: 80. 1831.

叉柱花属 cha zhu hua shu

Authors: Jia-qi Hu & Thomas F. Daniel

Ebermaiera Nees.

Annual or perennial herbs or small shrubs, without cystoliths. Stems very short or elongate. Leaves in a basal rosette or cauline, opposite (or alternate, especially apically), petiolate or sessile; leaf blade margin entire or nearly so. Inflorescences terminal or axillary, racemes or spikes; bracts opposite or alternate, leaflike or usually well differentiated from leaves; bracteoles present. Calyx 5-lobed almost to base; lobes equal or unequal. Corolla tube cylindric or basally cylindric and apically expanding into a campanulate throat; limb subactinomorphic to 2-lipped, 5-lobed; lobes subequal, patent, descending cochlear in bud. Stamens 4, didynamous, included or anterior pair slightly exserted; filaments usually hairy; anthers 2-thecous; thecae parallel, usually equal; staminode 1 or more, sometimes absent. Ovary with usually 12-60 ovules arranged in 2 or 4 rows per locule; style glabrous; stigmas 2-lobed, sometimes repeatedly 2-lobed. Capsule oblong, many seeded; retinacula absent. Seeds minute, subspherical or cuboid.

About 140 species: tropical regions worldwide; 17 species (eight endemic) in China.


1 Bracts pinnately veined   (2)
+ Bracts not pinnately veined   (3)
       
2 (1) Plants to 20 cm tall; leaf blade 2.5-6 × 1-2 cm; spikes ca. 1 cm.   7 S. paotingensis
+ Plants to 1 m tall; leaf blade 13-17 × 4.5-7 cm; racemes to 15 cm.   8 S. rivularis
       
3 (1) Leaf blade base cordate.   5 S. chapaensis
+ Leaf blade base cuneate, rounded, or attenuate   (4)
       
4 (3) Stems very short; leaves forming a basal rosette   (5)
+ Stems elongate; leaves cauline   (7)
       
5 (4) Leaf blade oblanceolate, widest above middle.   10 S. concinnula
+ Leaf blade ovate-oblong, elliptic, oblong, ovate, or oblong-obovate, widest below middle   (6)
       
6 (5) Leaf blade adaxially villous; corolla ca. 2 cm.   6 S. sinica
+ Leaf blade adaxially strigose; corolla ca. 5.5 mm.   12 S. strigosa
       
7 (4) Calyx 1.8-2.4 cm; corolla 3-4 cm.   4 S. sesamoides
+ Calyx less than 1.5 cm; corolla less than 2.5 cm (corollas unknown in S. sichuanica and S. yunnanensis)   (8)
       
8 (7) Leaf blade linear, 5-9 mm wide, length/width greater than 5.   13 S. stenophylla
+ Leaf blade lanceolate, ovate-lanceolate, oblong, or elliptic, usually broader than 1 cm, length/width less than 3   (9)
       
9 (8) Calyx lobes spatulate.   15 S. petelotii
+ Calyx lobes linear, lanceolate, or triangular   (10)
       
10 (9) Longer pair of stamens slightly exserted.   1 S. hypoleuca
+ Stamens all included   (11)
       
11 (10) Inflorescences all borne on axillary brachyblasts.   2 S. longicuneata
+ Inflorescences not all borne on axillary brachyblasts   (12)
       
12 (11) Inflorescences terminal only; calyx lobes unequal   (13)
+ Inflorescences terminal and axillary; calyx lobes subequal or equal   (14)
       
13 (12) Bracts adaxially densely pubescent.   14 S. yunnanensis
+ Bracts glabrous or subglabrous.   16 S. vicina
       
14 (12) Stems suberect or ascending from a decumbent base.   17 S. debilis
+ Stems erect   (15)
       
15 (14) Filaments glabrous.   11 S. hainanensis
+ Filaments pubescent   (16)
       
16 (15) Peduncles, rachises, and pedicels puberulent.   3 S. sichuanica
+ Peduncles, rachises, and pedicels glabrous.   9 S. brachystachya

  • List of lower taxa


     

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  • Staurogyne (PDF)
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