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FOC | Family List | FOC Vol. 13 | Clusiaceae

3. Triadenum Rafinesque, Fl. Tellur. 3: 78. 1837.

三腺金丝桃属 san xian jin si tao shu

Authors: Xi-wen Li & Norman K. B. Robson

Herbs, perennial, rhizomatous, glabrous, with translucent ("pale") glands only. Leaves opposite, sessile or petiolate, entire; venation pinnate; glands punctiform only. Flowers bisexual, homostylous. Sepals 5, quincuncial, equal, free. Petals 5, imbricate, flesh-pink or white, ± symmetric, deciduous after anthesis. Stamens in 5 fascicles united to form apparently 3 (i.e., 2 + 2 + 1) with compound fascicles antisepalous, persistent, each fascicle with 3 stamens; filaments rather slender, 0.35-0.5 united; anthers small, dorsifixed, dehiscing longitudinally, with gland on connective; sterile fascicles (fasciclodes) 3, yellow to orange, inserted between stamen fascicles, persistent. Ovary 3-loculed with axile placentae, each placenta with numerous ovules; styles 3, free, ± slender; stigmas narrowly to scarcely capitate. Fruit a septicidal capsule, with valves longitudinally and prominently vittate. Seeds small, carinate; testa reticulate-foveolate, not arillate; embryo slender, straight, with distinct slender cotyledons.

Six species: one in NE India (Khasia Hills) and S China, one in NE China, Korea, Russia (Far East), and Japan, and four in E Canada and the E United States.

1 Petals flesh-pink; inflorescence from 2 nodes, narrowly cylindric to narrowly ellipsoid; leaves ovate-oblong to oblong or oblong-lanceolate (l:w = 2-3), base cordate-amplexicaul.   1 T. japonicum
+ Petals white; inflorescence from 6-11 nodes, spikelike; leaves narrowly elliptic to oblong (l:w = 3-5), base attenuate.   2 T. breviflorum

Lower Taxa


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