Left: Ying T.S. et al., The endemic genera of seed plants in China, Fig. 128 (1993); with permission.
Right: Li Z.Y. & Wang Y.Z., Plants of Gesneriaceae in China, Fig. 1.34 (2004); with permission.
Full name and orig. publication: Tremacron Craib, Notes Roy. Bot. Gard. Edinburgh 10: 217 (1918).
Etymology: From the Greek τρεμα, trema = hole, pore, and ακρον, akron = extremity, tip, top; alluding to the anthers which open with a transversal slit at the top.
Synonyms: -
Infrafamilial position: Didymocarpoid Gesneriaceae - "Advanced Asiatic and Malesian genera" (Weber 2004).
Description: Perennial rosette herbs. Leaves radial, shortly petiolate, lamina elliptic, ovate, cordate-ovate or cordate-orbicular, crenate or dentate, both surfaces pubescent. Cymes long-pedunculate, with several flowers, bracteoles linear. Sepals free to base, narrowly lanceolate. Corolla yellow, white or red, subglabrous, tubular-campanulate, limb bilabiate, upper lip short, emarginate, lower lip with 3 rounded lobes. Stamens 4, of nearly equal length, rarely didynamous, exserted; filaments inserted near base of corolla tube; anthers globose, divaricate, locules apically confluent. Nectary annular or cyathiform. Ovary oblong or slender cylindrical; stigma bilobed. Capsule oblong or slender cylindrical.
Chromosome number: Unknown.
Species number: 7.
Type species: Tremacron forrestii Craib
Distribution: S China (Yunnan, Sichuan).
Ecology: Growing in evergreen forests, on large boulders and on rocky cliffs, (1000-)2500-3200 m.
Selected references: Pan, Acta Phytotax. Sin. 26: 429-442 (1988); Wang et al. in Wu & Raven (eds.), Fl. China 18: 261-265 (1998) (Chinese spp.).
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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Tremacron forrestii Craib, type species
Left: Ying T.S. et al., The endemic genera of seed plants in China, Fig. 128 (1993); with permission. Right: Li Z.Y. & Wang Y.Z., Plants of Gesneriaceae in China, Fig. 1.34 (2004); with permission. |
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Tremacron urceolatum K.Y. Pan Li Z.Y. & Wang Y.Z., Plants of Gesneriaceae in China, Fig. 1.35 (2004); with permission. |
last modified: 2007-07-13