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FOC | Family List | FOC Vol. 19 | Acanthaceae

27. Peristrophe Nees in Wallich, Pl. Asiat. Rar. 3: 77, 112. 1832.

观音草属 guan yin cao shu

Authors: Jia-qi Hu & Thomas F. Daniel

Herbs or shrubs, with cystoliths. Leaf blade margin entire or slightly toothed. Inflorescences in axillary or terminal cymes, these sometimes aggregated into a leafy panicle-like complex; cymes consisting of (1 or)2-4(or more) involucres; involucres of usually 1-3 flowers enclosed by 2(or more) pairs of bracteoles that conceal calyx and corolla tube. Outer pair of bracteoles equal to unequal in size and larger than inner pair(s). Calyx small, 5-lobed; lobes equal. Corolla white to pink or purple, usually large, resupinate 180°; tube slender, twisted, apically ± widened into throat; limb 2-lipped; upper lip (in lower position) entire to 2-cleft; lower lip (in upper position) 3-lobed; lobes ascending cochlear in bud. Stamens 2, inserted at corolla throat, exserted from corolla tube; anthers 2-thecous; thecae unequally inserted or superposed (contiguous or separated by gap), base muticous; staminodes absent. Ovary with 2 ovules per locule; stigma slightly enlarged or 2-cleft. Capsule with a solid stalk, 4-seeded; retinacula present; placenta not rising elastically from base of valves. Seeds discoid, smooth to tuberculate, lacking trichomes.

About 40 species: tropical and subtropical Africa, Asia, and Madagascar, with one species possibly extending to Australia (see R. M. Barker, J. Adelaide Bot. Gard. 9: 192. 1986); ten species (three endemic) in China.


1 Outer involucral bracteoles abaxially pubescent with gland-tipped trichomes   (2)
+ Outer involucral bracteoles abaxially glabrous or pubescent with non-glandular trichomes   (3)
       
2 (1) Corolla ca. 4.5 cm, pubescent with gland-tipped and non-glandular trichomes.   1 P. lanceolaria
+ Corolla ca. 1 cm, outside pubescent with non-glandular trichomes.   2 P. paniculata
       
3 (1) Anther thecae superposed (i.e., one entirely above other and with a gap between them)   (4)
+ Anther thecae inserted at same level or at different levels but overlapping   (5)
       
4 (3) Corolla ca. 1 cm; outer involucral bracteoles subulate to lanceolate to linear, less than 3 mm wide; capsule pubescent with non-glandular trichomes.   2 P. paniculata
+ Corolla 3-3.4 cm; outer involucral bracteoles ovate to elliptic, more than 5 mm wide; capsule pubescent with gland-tipped and non-glandular trichomes.   10 P. japonica
       
5 (3) Anther thecae inserted at same level.   3 P. yunnanensis
+ Anther thecae inserted at different levels   (6)
       
6 (5) Outer involucral bracteoles less than 2 × as long as calyx   (7)
+ Outer involucral bracteoles more than 2 × as long as calyx   (8)
       
7 (6) Leaf blade subglabrous.   4 P. tianmuensis
+ Leaf blade densely pubescent.   5 P. strigosa
       
8 (6) Corolla and capsule glabrous.   6 P. montana
+ Corolla and capsule pubescent   (9)
       
9 (8) Leaf blade adaxially puberulent (especially along midvein) or becoming subglabrescent; corolla 3-5.7 cm.   7 P. bivalvis
+ Leaf blade adaxially sparsely pubescent; corolla 2-4 cm   (10)
       
10 (9) Outer involucral bracteoles narrowly ovate to lanceolate, more than 4 × as long as wide.   8 P. floribunda
+ Outer involucral bracteoles ovate to oblong to elliptic, less than 3 × as long as wide   (11)
       
11 (10) Outer involucral bracteoles ovate to oblong, abaxially slightly villous, base subcordate.   9 P. fera
+ Outer involucral bracteoles ovate to elliptic, abaxially subglabrous to puberulent, base cuneate to truncate.   10 P. japonica

Lower Taxa


 

Related Objects  
  • Peristrophe (PDF)
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