Flora of China
  FOC Vol.8 (2001)              | Family List  Brassicaceae  PDF Oreoloma  PDF   | Link Font:+ Big | - Small
   81. Oreoloma  Botschantzev
爪花芥属   zhao hua jie shu


Herbs perennial, with a distinct caudex. Trichomes dendritic, mixed with stalked glandular ones. Stems erect, simple or branched basally and/or apically. Basal leaves petiolate, rosulate, simple, pinnatifid, pinnatisect, sinuate-dentate, repand, or entire. Cauline leaves few to many. Racemes ebracteate, elongated in fruit. Fruiting pedicels thickened, nearly as wide as fruit, divaricate. Sepals oblong-linear, erect, unequal, base of lateral pair saccate, margin membranous. Petals purple, pink, yellow, or rarely white; blade broadly obovate or spatulate, apex rounded; claw well differentiated from blade, longer than sepals. Stamens 6, strongly tetradynamous; median filaments connate into 2 pair, dilated at base; anthers narrowly oblong, obtuse at apex. Nectar glands 2, lateral, annular or semiannular; median glands absent. Ovules 8-50 per ovary. Fruit tardily dehiscent siliques opening basipetally, not breaking transversely into segments, linear or oblong, terete, sessile; valves corky, not veined, with glandular and/or dendritic trichomes, not torulose or moniliform; replum flattened; septum complete, thickened; style prominent, short, or obsolete; stigma capitate or linear, obscurely to strongly 2-lobed, lobes spreading, free, not decurrent. Seeds uniseriate, wingless, oblong, slightly flattened; seed coat not mucilaginous when wetted; cotyledons incumbent.

Three species: China, Mongolia; three species (two endemic) in China.

Oreoloma, which is almost exclusively Chinese, is most closely related to Sterigmostemum, a genus distributed primarily in SW Asia. It consists of perennials with erect, unequal, basally saccate sepals, large petals, (1-)1.3-2.2 cm, strongly differentiated into a blade and claw, and fruit not breaking transversely into segments. Sterigmostemum comprises mostly annuals with ascending, equal, nonsaccate sepals, smaller petals, 0.5-1(-1.2) cm, undifferentiated into a blade and claw, and fruit generally breaking transversely into segments.

1Stigma capitate, subentire or obscurely with lobes as long as wide; cauline leaves more than 10; median filaments 5-6(-7) mm; ovules 8-14 per ovary1  O. matthioloides    紫爪花芥
+Stigma linear, with 2 prominent lobes much longer than wide; cauline leaves absent or 1-3(-6); median filaments (8-)9-15 mm; ovules 20-50 per ovary.(2)
2(1)Leaves pinnatisect, pinnatifid, or rarely sinuate-dentate; plants densely glandular throughout; fruiting pedicels 2-4(-6) mm; ovules 20-30 per ovary2  O. violaceum    爪花芥
+Leaves entire or repand; plants sparsely glandular on sepals subapically and pedicels, very rarely throughout; fruiting pedicels (4-)6-12(-15) mm; ovules 40-50 per ovary3  O. eglandulosum    少腺爪花芥
   Lower Taxon
  • Oreoloma matthioloides  (Franchet) Botschantzev  紫爪花芥
  • Oreoloma violaceum  Botschantzev  爪花芥
  • Oreoloma eglandulosum  Botschantzev  少腺爪花芥