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FOC | Family List | FOC Vol. 18 | Gesneriaceae

6. Tremacron Craib, Notes Roy. Bot. Gard. Edinburgh. 10: 217. 1918.

短檐苣苔属 duan yan ju tai shu

Herbs, perennial, epipetric or terrestrial, rhizomatous, stemless. Leaves many, basal; leaf blade villous to puberulent, base attenuate to cordate. Inflorescences sometimes umbel-like, lax, axillary, 1- to many-flowered cymes; bracts 2, opposite. Calyx actinomorphic, 5-sect from base; segments equal. Corolla yellow to red or white, zygomorphic, inside usually glabrous; tube subcampanulate to funnelform-tubular, not swollen, 5-6 X longer than limb, 3-7 mm in diam.; limb 2-lipped; adaxial lip emarginate to nearly entire, extremely short, extending only slightly beyond mouth; abaxial lip 3-lobed, central lobe longer than laterals, apex rounded. Stamens 4, adnate to corolla near base, all or only abaxial ones exserted; anthers basifixed, free, thecae parallel, divergent at base, confluent at apex, dehiscing longitudinally; connective not projecting; staminode 1, rarely absent, adnate to adaxial side of corolla tube. Disc ringlike. Ovary narrowly oblong, 1-loculed; placentas 2, parietal, projecting inward, 2-cleft. Stigmas 2, equal, oblate, undivided, rarely 2-lipped. Capsule straight in relation to pedicel, oblong lanceolate to narrowly oblong, much longer than calyx, dehiscing loculicidally to base; valves 2, straight, not twisted. Seeds unappendaged.

* Seven species: endemic to China.

1 Corolla red; leaf blade length 3-5 X width   7 Tremacron rubrum
+ Corolla yellow to orange or white; leaf blade length usually less than 2 X width, rarely length to 3 X width.   (2)
2 (1) Cymes 1-3-flowered; peduncle puberulent or puberulent and villous, without glandular hairs, 3-8.5 cm.   (3)
+ Cymes 3-15-flowered; peduncle villous and glandular puberulent and sometimes pubescent, 4-20 cm.   (4)
3 (2) Petiole to 7 cm; leaf blade adaxially white puberulent, base cordate; pedicel ca. 1 cm; corolla white, abaxial lip purplish, 0.6-0.8 cm, tube subcampanulate, urceolate; pistil ca. 4 mm   5 Tremacron begoniifolium
+ Petiole to 2 cm; leaf blade adaxially white villous, base broadly cuneate; pedicel 2-2.5 cm; corolla orange, ca. 1.2 cm, tube funnelform-tubular; pistil 8.5-10 mm   6 Tremacron aurantiacum
4 (2) Leaf blade 3-12(-17) X 2-4(-6) cm, margin serrate or double serrate to deeply crenate-serrate, adaxially white appressed puberulent and sparsely rust-brown villous   1 Tremacron forrestii
+ Leaf blade 1-6 X 1-4 cm, margin crenate to serrate or dentate, adaxially densely white to gray villous, puberulent, or sericeous and pubescent, without rust-brown hairs.   (5)
5 (4) Leaf blade adaxially densely white villous; peduncle 8-11 cm; bracts puberulent   2 Tremacron urceolatum
+ Leaf blade adaxially densely sericeous and pubescent or white puberulent; peduncle 7-20 cm; bracts villous.   (6)
6 (5) Petiole to 1(-2.5) cm; leaf blade adaxially densely sericeous and pubescent, abaxially pubescent, veins densely long villous; corolla white to greenish white; pistil pubescent to glabrescent   3 Tremacron mairei
+ Petiole to 4 cm; leaf blade appressed white puberulent on both surfaces; corolla yellow; pistil glabrous   4 Tremacron obliquifolium

Lower Taxa


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