422 



CRUCIFBRAE (MUSTAKD FAMILY) 



Petals white. 



Valves of pod conspicuously keeled 



Valves of pod rounded or flat. 

 Pods terete ... ...... 



Pods more or less flattened . 



Hairs at least in part branched. 

 Stigma obtusely cone-shaped ; petals purple, 15-20 mm. long . 

 Stigma otherwise ; petals smaller. 

 Pods terete or 4-angled, sometimes torulose. 



Tall, 6-12 dm. high ; pods 8 cm. long 



Not over 8 dm. high ; pods shorter. 



Annual ; pods not torulose 



Perennial; pods more or less torulose 



• Pods decidedly flattened. 



Pods lanceolate to narrowly oblong, rarely over 18 mm, in length 

 Pods linear, when normal and mature 15-80 mm. long . . 



16. Alliabia. 



28. Kadicula. 

 30. Caedaminb, 



21. Hesprris. 



81. Aba BIS. 



19. SiSTMBBlDU. 



20. Beava. 



1. Draba. 

 81. Ababis. 



1. DRAbA [Dill.] L. 



Pod oval, oblong, or even linear, flat ; the valves plane or slightly convex ; 

 the partition broad. Seeds several or numerous, in 2 rows in each cell, 

 marginless. Cotyledons acoumbent. Filaments not toothed. — 

 Low herbs with entire or toothed leaves, and white or yellow 

 flowers; pubescence often stellate. (Name from Spd/Sij, applied 

 by Dioscorides to some cress ; meaning unknown.) 



§ 1. ER6PHILA (DC.) Reichenb. Annual or biennial; flowers 

 white, cleistogamous ; petals 2-cleft. 



1. D. VERNA L. (Whitlow Grass.) Small (scapes 2.5-8 cm. 



V high) ; leaves all radical, oblong or lanceolate ; racemes elongated in 



T81 D. verna ^^^^ ! V°^ varying from round-oval to oblong-lanceolate, smooth. 



Part of fruiting shorter than the pedicels. — Sandy waste places and roadsides, 



raceme x%. ^- M^^s. to Minn, and southw. — A species remarkable as an 



Petal X 1%. aggregate of many closely related forms which, from their cleis- 



togamy, seldom cross or intergrade Apr., May. (Nat. from 



Eu.) Fig. 731. 



§ 2. DRABELLA DC. Winter annuals ; leafy stems short; leaves oblong or 

 obovate, hairy, sessile; petals entire or merely emarginate, white (yellow in 

 no. 4) ; style none. 



2. D. carollni&na Walt. SmaU (2.5-12 cm. high) ; pedun- 

 cles scape-like ; petals usually twice the length of the calyx ; 

 raceme short or corymbose in fruit (1.2-2.5 cm. long); pods 

 broadly linear, smooth, much longer than the ascending pedi- 

 cels. — Sandy and waste fields, e. Mass. to Minn., Neb., 

 and southw. March-May. Fig. 732. — Petals often wanting 

 in the later racemes, especially in the var. micrAntha (Nutt.) 



Gray, with minutely rough-hairy pods, 



which is found with the other, westw. 



3. D. cuneifdlia Nutt. Leaves obovate, 

 wedge-shaped, or the lowest spatulate, 

 toothed ; raceme somewhat elongated in 

 fruit (2.5-7.5 cm.), at length equaling the 

 naked peduncle; petals emarginate, much 

 longer than the calyx ; pods oblong-linear, 

 minutely hairy, longer than the spreading 

 pedicels. — Grassy places, Ky., 111.? to e. 

 Kan., southw., and southwestw. March, 

 Apr. Fig. 733. 



4. D. brachycSrpa Nutt. Low (5-10 

 cm. high), minutely pubescent; stems 

 leafy to the base of the dense at length 

 elongated raceme ; leaves (4-8 mm. long) 783. D. cnnelfoHa. 

 narrowly oblong or the lowest ovate, few- Fruiting raceme x y. 



782. D. caroHniana. 

 Fruiting raceme X Vs- 

 Fruit with valves re- 

 moved X 1%. 



784. D. brachycarpa, 

 Inflorescence x Va. 



