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FOC | Family List | FOC Vol. 19 | Acanthaceae

12. Pararuellia Bremekamp & Nannega-Bremekamp, Verh. Kon. Ned. Akad. Wetensch., Afd. Natuurk., Sect. 2. 45(1): 25. 1948.

地皮消属 di pi xiao shu

Authors: Jia-qi Hu & Thomas F. Daniel

Herbs, perennial. Stems short. Leaves opposite, rosulate, petiolate; leaf blade margin undulate, crenulate, or rarely subentire. Inflorescences terminal, spikes or thyrses; bracts usually subleaflike; bracteoles present. Flowers sessile. Calyx subequally to equally 5-lobed. Corolla white, bluish, or pink; tube basally cylindric and slender, apically expanded into a throat; limb 5-lobed; lobes subequal, contorted in bud, apex rounded or obtuse. Stamens 4, didynamous, inserted at base of throat; filaments glabrous; anthers 2-thecous; thecae usually widely separated by a broad connective, ± parallel; staminodes absent. Ovary glabrous, with 4-8 ovules per locule; style pubescent; stigma pubescent, 2-cleft, upper lobe very short or reduced. Capsule cylindric, not stipitate, 8-16-seeded; retinacula present. Seeds lenticular, pubescent with hygroscopic hairs.

About ten species: SE Asia, China; five species (all endemic) in China.

Pararuellia is purported to differ from Ruellia by its pollen, which has "minute prickles, papillae or granules (not a honey-combed pattern)" (C. B. Clarke, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 74: 649. 1908) or at least papillae on the muri of reticulations (C. C. Hu et al., Acta Phytotax. Sin. 43: 123-150. 2005). Because such structures are also known from some species of Ruellia (C. A. Furness & M. C. Grant, Grana 35: 231-239. 1996), the generic status of Pararuellia is questionable and deserves additional study.

1 Bracts longer than rachis internodes, imbricate, homomorphic; spikes cylindric; flowers imbricate on rachis.   1 P. glomerata
+ Bracts shorter than rachis internodes, distant, usually heteromorphic; spikes not cylindric; flowers distant on rachis   (2)
2 (1) Spikes usually with 1 or 2(or 3) nodes.   5 P. delavayana
+ Spikes with 4 to many nodes   (3)
3 (2) Rachis usually zigzag, winged below nodes.   2 P. alata
+ Rachis straight, wingless   (4)
4 (3) Bracts oblong, elliptic, or ovate, usually subtending many flowers.   3 P. cavaleriei
+ Bracts cordate to suborbicular, usually subtending only 1 flower.   4 P. hainanensis

Lower Taxa


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