Ying T.S. et al., The endemic genera of seed plants of China, Fig. 102 (1993); with permission.
Full name and orig. publication: Allostigma W.T.Wang, Acta Phytotax. Sin. 22: 185 (June 1984).
Etymology: From the Greek αλλος, allos = diverse, different, and στιγμα, stigma = stigma, alluding to the stigma with two strongly unequal lobes.
Synonyms: -
Infrafamilial position: Didymocarpoid Gesneriaceae - "Advanced Asiatic and Malesian genera" (Weber 2004).
Description: Perennial herbs. Stems 4-angled, densely pubescent. Leaves opposite, distant, petiolate, lamina ovate to elliptic, serrate, lower surface densely yellow glandular punctate, both surfaces puberulous. Cymes axillary; peduncle pubescent; bracteoles linear, pubescent; pedicels pubescent. Sepals 5, fused, lobes linear-lanceolate. Corolla funnel-shaped, bilabiate, lavender; upper lip 2-partite, lower lip 3-lobed. Stamens 2, inserted at middle of corolla tube; filaments slightly curved, wider at middle; anthers elliptic-globose, basifixed, connate at apex; staminodes 3, glabrous. Nectary cup-shaped. Ovary linear, puberulous; style puberulous; stigma bilobed, upper lobe small, triangular, lower lobe much larger, subtruncate. Capsule slender cylindrical, puberulous.
Chromosome number: Unknown.
Type and only species: Allostigma guangxiense W.T.Wang
Species name (incl. publication and synonyms): See Skog, L.E. & J.K. Boggan. 2005: World checklist of Gesneriaceae: http://persoon.si.edu/Gesneriaceae/Checklist.
Distribution: S China (Guangxi).
Ecology: Growing on limestone pavements; c. 200m.
Notes: Allostigma is very similar to Pseudochirita except that it has axile placentation while Pseudochirita has parietal placentation.
Selected references: Wang et al. in Wu & Raven (eds.), Fl. China 18: 293 (1998).
Bibliography: See Skog, L.E. & J.K. Boggan. 2005. Bibliography of the Gesneriaceae. 2nd edition: http://persoon.si.edu/Gesneriaceae/Bibliography.
Illustrations:
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Allostigma guangxiense W.T.Wang, type and only species.
Ying T.S. et al., The endemic genera of seed plants of China, Fig. 102 (1993); with permission. |
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Allostigma guangxiense W.T.Wang Li Z.Y & Wang Y.Z., Plants of Gesneriaceae in China, Figs. 1.103 and 1.104 (2004); with permission. |
last modified: 2007-07-13