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FOC | Family List | FOC Vol. 8 | Brassicaceae

60. Rorippa Scopoli, Fl. Carniol. 520. 1760.

蔊菜属 han cai shu

Rorippa palustris

Credit: Photo: Al-Shehbaz

Tetrapoma Turczaninow ex Fischer & C. A. Meyer.

Herbs annual, biennial, or perennial, usually of wet or aquatic habitats. Trichomes absent or simple. Stems erect or prostrate, simple or branched, leafy. Basal leaves petiolate, rosulate or not, simple, entire, dentate, sinuate, lyrate, pectinate, or 1-3-pinnatisect. Cauline leaves petiolate or sessile, cuneate, attenuate, auriculate, or sagittate at base, entire, dentate, pinnatifid, or pinnatisect. Racemes ebracteate or rarely bracteate throughout, elongated in fruit. Sepals ovate or oblong, erect or spreading, base of lateral pair not saccate or rarely saccate, margin often membranous. Petals yellow, sometimes white or pink, rarely vestigial or absent; blade obovate, spatulate, oblong, or oblanceolate, apex obtuse or emarginate; claw sometimes distinct, often shorter than sepals. Stamens 6 and tetradynamous, rarely 4 and equal in length; anthers ovate or oblong, obtuse or rarely apiculate at apex. Nectar glands confluent, often subtending bases of all stamens; median glands narrow; lateral glands semiannular and intrastaminal, or annular. Ovules 10-300 per ovary. Fruit dehiscent siliques or silicles, linear, oblong, ovoid, ellipsoid, or globose, terete or slightly latiseptate, sessile or rarely shortly stipitate; valves 2(or 3-6), papery or leathery, veinless or obscurely veined, smooth or torulose; replum rounded; septum complete or rarely perforated, membranous, translucent, veinless; style obsolete or distinct; stigma capitate, entire or slightly 2-lobed. Seeds biseriate or rarely uniseriate, wingless or rarely winged, oblong, ovoid, or ellipsoid, plump; seed coat reticulate, colliculate, rugose, tuberculate, or foveolate, mucilaginous or not when wetted; cotyledons accumbent.

About 75 species: worldwide; nine species in China.

1 Racemes bracteate throughout or rarely along lowermost third.   (2)
+ Racemes ebracteate, rarely lowermost 1 or 2 flowers bracteate.   (3)
2 (1) Fruiting pedicels slender, 3-6.5(-8) mm; fruit linear, 7-17(-21) × 1.2-1.6 mm; seeds colliculate   4 R. benghalensis
+ Fruiting pedicels stout, (0.3-)0.7-2(-3) mm; fruit oblong, (3-)4.5-8.5(-10) × 1.5-2.5 mm; seeds foveolate   5 R. cantoniensis
3 (1) Fruiting pedicels erect to erect-ascending, subappressed to rachis; fruit valves with a distinct midvein; seeds 1.1-1.5 × 0.7-1.1 mm   6 R. elata
+ Fruiting pedicels ascending, divaricate, or reflexed, not appressed to rachis; fruit valves not veined; seeds 0.4-0.9 × 0.3-0.6 mm.   (4)
4 (3) Fruit globose, oblong, ellipsoid, or oblong-ovoid, length less than 3 × width.   (5)
+ Fruit linear, rarely linear-oblong, length more than 4 × width.   (7)
5 (4) Fruit oblong, ellipsoid, or oblong-ovoid, often slightly curved; seeds colliculate   9 R. palustris
+ Fruit globose or subglobose, not curved; seeds reticulate.   (6)
6 (5) Fruit valves 2, papery; sepals (1-)1.3-1.8(-2) mm; petals 0.7-1.3(-1.5) × 0.3-0.8 mm   7 R. globosa
+ Fruit valves (3 or)4(-6), leathery; sepals 1.6-2.8 mm; petals (1.5-)1.8-3(-3.5) × 0.7-1.8(-2) mm   8 R. barbareifolia
7 (4) Perennials; middle cauline leaves deeply pinnatisect; fruit rarely producing seeds; seeds colliculate   1 R. sylvestris
+ Annuals; middle cauline leaves lyrate-pinnatipartitite or undivided; fruit producing numerous seeds; seeds foveolate.   (8)
8 (7) Fruit often curved, (0.7-)1-2.4(-3) cm × 1-1.5(-2) mm; seeds biseriate or nearly so; petals longer than sepals, (2.5-)3-4(-4.5) × 1-1.5 mm, rarely absent   2 R. indica
+ Fruit straight, (1.5-)2.5-4 cm × 0.7-0.9(-1) mm; seeds uniseriate; petals mostly absent, if present then often shorter than sepals and 1.5-2.5 × 0.2-0.7(-1)   3 R. dubia

Lower Taxa


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