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FOC | Family List | FOC Vol. 8 | Brassicaceae

22. Hemilophia Franchet, Pl. Delavay. 65. 1889.

半脊荠属 ban ji ji shu

Hemilophia sessilifolia

Credit: Photo: Sun Hang

Herbs perennial, rhizomatous. Trichomes simple, malpighiaceous, or sometimes minutely forked. Stems ascending or decumbent, simple or branched. Basal leaves petiolate, rosulate, simple, entire. Cauline leaves petiolate or sessile, attenuate, entire. Racemes several flowered, bracteate throughout. Fruiting pedicels slender, ascending or divaricate, straight or curved. Sepals ovate, oblong, or obovate, ascending, glabrous or pubescent, base of lateral pair subsaccate. Petals yellowish, white, pink, or purple, caducous or persistent, longer than sepals; blade narrowly to broadly obovate or obcordate, apex shallowly to deeply emarginate. Stamens 6, slightly tetradynamous; filaments of lateral stamens filiform, those of median pairs strongly dilated or appendaged basally; anthers ovate, apiculate or not at apex. Nectar glands confluent, subtending bases of all stamens. Ovules 2 per ovary. Fruit dehiscent silicles, oblong, terete, sessile or subsessile; valves papery, navicular, veinless, glabrous, with 3 rows of crests; replum rounded; septum absent; style to 1.5 mm, cylindric or conical, persistent, glabrous or minutely papillate; stigma capitate, entire. Seeds 1 or 2 per fruit, wingless, oblong, plump; seed coat smooth, not mucilaginous when wetted; cotyledons obliquely accumbent.

* Four species.

1 Cauline leaves sessile; sepals membranous throughout, readily caducous at anthesis; petals persistent till fruit dehiscence; style glabrous, conical; stem trichomes exclusively simple; raceme not elongated in fruit   4 H. sessilifolia
+ Cauline leaves petiolate; sepals membranous only at margin, remaining until young fruit develops; petals caducous; style minutely papillate, cylindric; stem trichomes crisped simple and forked, or malpighiaceous; raceme elongated considerably in fruit.   (2)
2 (1) Petals purplish; leaf trichomes setose, appressed; sepals not ciliate; stem with malpighiaceous, noncrisped trichomes   1 H. franchetii
+ Petals pink, creamy white or yellowish; leaf glabrous or crisped pilose; sepals ciliate; stems puberulent with crisped trichomes.   (3)
3 (2) Petals 2.5-3.5 × 1.5-2 mm, narrowly obovate, pink; base of median filaments slightly dilated, not appendaged, 0.2-0.3 mm wide; leaves glabrous or rarely sparsely pilose; trichomes on inflorescence rachis obsoletely branched   2 H. pulchella
+ Petals 5-7 × 3-5 mm, obcordate, creamy white to yellowish; base of median filaments conspicuously broadened, appendaged, 0.6-1.1 mm wide; leaves pilose or rarely glabrescent; trichomes of inflorescence rachis minutely branched   3 H. rockii

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