264 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO THE GENERA. 
Pods indehiscent, 1-celled, with perforated wing- 
MATZIN.. 2... eee ee eee eee ee eee 
Pods dehiscent (except in Dithyraea and Raphanus), 
2-celled, not wing-margined. 
Podsstipitate, terete. (Anthers sometimes curved 
or twisted.) 
Pods long-stipitate; stipes slender .......... 
Pods ghort-stipitate; stipes stout. 
Sepals spreading in anthesis, soon decidu- 
OUS . 202.22 eee ee eee eee eee eee eee 
Sepals erect or ascending in anthesis. 
(Stigma entire or indistinctly lobed, 
the lobes expanded over the valves. ) 
Stigma conical; outer sepals gibbous 
at the base ..................- 
Stigma truncate; sepals scarcely gib- 
bous at’ the base. 
Septum of pod with a strong 
midrib .............-.--- 
Pods not stipitate, of various shapes. 
Anthers sagittate at the base, spirally curved. 
Pods terete; flowers small, more or less 
irregular; calyx not urceolate...... 
Pods flattened parallel to the partition; 
flowers large, regular; calyx urceo- 
Anthers neither sagittate nor spirally curved. 
Pods more or less flattened contrary to 
the narrow septum. 
Pods didymous; plants densely stel- 
late-pubescent. 
Seeds solitary in each cell, the 
halves of the pod falling 
with the contained seeds; 
pods strongly flattened .... 
Seeds 1 or 2 in each cell, not 
retained by the valve; 
pods inflated............. 
Podsnot didymous; plants not densely 
stellate (except in Nerisy- 
renia). 
Pods oblong-linear, little com- 
pressed; plants strongly 
stellate-pubescent .....-.-- 
Pods orbicular, oval, or cuneate, 
strongly flattened; plants 
not stellate-pubescent. 
Cells 1-seeded; pods broadest 
at the base. 
1. THYSANOCARPUS (p. 266). 
2. STANLEYA (p. 266). 
3. STANLEYELLA (p. 267). 
4. HesPERIDANTHUS (p.267). 
5. PLEUROPHRAGMA (p. 267). 
6. THELYPOpIUM (p. 268). 
7. Hereroruerx (p. 268). 
8. EUKLISIA (p. 268). 
9. Diruyraka (p. 269). 
10. PHysarta (p. 270). 
11. NERISYRENIA (p. 270). 
