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FOC | Family List | FOC Vol. 19 | Acanthaceae

9. Hygrophila R. Brown, Prodr. 479. 1810.

水蓑衣属 shui suo yi shu

Authors: Jia-qi Hu & Thomas F. Daniel

Adenosma Nees (1847), not R. Brown (1810); Asteracantha Nees; Cardanthera Buchanan-Hamilton ex Bentham & J. D. Hooker; Hemiadelphis Nees; Kita A. Chevalier; Nomaphila Blume; Physichilus Nees; Polyechma Hochstetter; Santapaua N. P. Balakrishnan & K. Subramanyam; Synnema Bentham; Tenoria Dehnhardt & Giordano (1832), not Sprengel (1813).

Herbs, annual or perennial, often aquatic or hygrophilous, sometimes with axillary spines, cystoliths present. Leaves sessile or shortly petiolate; leaf blade margin entire, crenulate, or sometimes undulate. Flowers sessile, in terminal spikes or several in axillary clusters; bracteoles present or absent. Calyx 5-lobed. Corolla ventricose; limb 2-lipped, lower lip 3-lobed, upper lip apex shallowly dentate; lobes contorted in bud. Stamens 2 or 4, didynamous (posterior pair similar to anterior pair or smaller); anthers 2-thecous; thecae equally inserted; staminodes 0 or 2. Ovary with 4 to many ovules per locule; stigma entire or 2-dentate. Capsule linear-ellipsoid to narrowly oblong, many seeded; retinacula present. Seeds discoid, covered with long mucilaginous trichomes.

About 100 species: widely distributed in tropical and subtropical regions; six species (one endemic) in China.

1 Stamens 2.   1 H. polysperma
+ Stamens 4   (2)
2 (1) Flowers in terminal spikes.   2 H. biplicata
+ Flowers solitary or clustered in leaf axils   (3)
3 (2) Leaf blade glabrous or scabrous-hirsute   (4)
+ Leaf blade densely strigose or hirsute on both surfaces   (5)
4 (3) Leaf blade glabrous or slightly pubescent.   3 H. ringens
+ Leaf blade scabrous-hirsute.   4 H. pogonocalyx
5 (3) Calyx ca. 0.7 cm; corolla ca. 1.5 cm.   5 H. erecta
+ Calyx ca. 1.1 cm; corolla 1.8-2.2 cm.   6 H. phlomoides

Lower Taxa


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