98 BRASSICACEAE 



Stigma entire, capitate: seeds marginless. 



Cotyledons obliquely accunibent; low perennials, with pink or 



purplish flowers. 42. Phaenocaulis. 



Coti'ledons incumbent; tall leafy plants, with greenish flowers. 



46. Chlorocr.\mbe. 

 Pod terete or tetragonal; anthers curved or twisted (except in Schoeno- 

 crambe). 

 Sepals unequal, the lower longer; hairs, at least some of them, stellate 



or branched. 49. Heterothrix. 



Sepals equal or nearly so; hairs simple or none. 

 Sepals erect or ascending in anthesis. 



Stigma distinctly lobed, its lobes expanded over the septum. 

 Plants with creeping rootstocks. 47. ScHOEXOCRAMBE. 



Plants with taproots. 48. Thelypodiopsis. 



Stigma entire or, if distinctly lobed, the lobes expanded over 

 the valves. 

 Stigma conical; outer sepals gibbous at the base. 



50. Hesperidanthus. 

 Stigma truncate; sepals scarcely gibbous at the base. 



Septum of the pod without a distinct midrib. 



51. Thelypodium. 

 Septum of the pod with a strong midrib. 



52. Pleurophragma . 

 Sepals strongly spreading or reflexed in anthesis, soon deciduous. 



53. St,ani,eyella. 



II. Pod terete, long-stipitate; sepals spreading or reflexed in anthesis; anthers curved 

 and spirally twisted. 54. Stanleta. 



1. ISATIS L. Woad. 1. I. tinctoria. 



2. CARDARIA Desv. • l. C. Draba. 



3. LEPIDIUM L. Peppergrass, Canary-grass, Bird-seed. 



Style evident, at least equalling the wing-margins. 

 Introduced annuals or biennials. 



Upper leaves entire, perfohately clasping. 1. L. perfoliatum. 



Leaves all pinnatifld, none clasping. 2. L. sativum. 



Native perennials. ^ 



Pods 2-4 mm. wide. 



Xone of the leaves pinnatifld. 



Basal leaves oblanceolate, entire-margined, thick; stamens 2. 



3. L. integrifolium. 

 Basal leaves more or less toothed, tliinner; stamens 6. 



Basal leaves truncate and 3-toothed at the apex. 4. L. Vaseyanum. 

 Basal leaves oblanceolate, acute at the apex, serrate-crenate. 



5. L. crenatum. 

 Basal leaves at least pinnatifld. 



Segments of the basal leaves short, obovate or oblanceolate in outhne; 

 petals obovate. 

 Styles 2-3 times as long as the wing-margms; racemes in age more or 

 less elongate. 

 Styles about 3 times as long as the wing-margins ; leaves coriaceous; 

 segments entire or merely round-toothed, obtusish; plant 

 glabrous; stem few-leaved. 6. L. scopulorum. 



Styles about 2 times as long as the wing-margins; leaves not cori- 

 aceous; segments usually cleft or deeply toothed, acute. 

 Upper stem-leaves hnear, entire; plant glabrous or the upper 



part of the stem shghtly puberulent. 7. L. Crandallii . 

 Leaves usually all pinnatifld; stem puberulent throughout. 

 Stem glaiidular-puberulent ; pod oval or ovate, narrowed 



towards the apex. 8. L. montanu?n. 



Stem densely papillose-puberulent; pod orbicular. 



9. L. papilliferum. 

 Styles slightly exceeding the wing-margins; racemes numerous, short; 

 plant puberulent. 10. L. brachybptryutn. 



Segments of the basal leaves elongate, linear, oblong, or lanceolate. 



Only the lower leaves pinnatifld; pod broadly oval; style scarcely 

 longer than the width of the wing-margins; petals orbicular. 



11. L. alyssoidcs. 

 Stem leaves except the uppermost also pinnatifld; pod narrower, acutish 



at both ends ; style about twice as long as the width of the wing- 

 margins: petals obovate to elliptic. 

 Plant low, 3 dm. high or less; leaves or their lobes narrowly linear. 



12. L. Jonesii. 

 Plant tall, 4-10 dm. high; upper leaves broadly linear or oblong. 



13. L. Eastwood iae. 

 Pods 6-8 mm. wide. 14. L. Fremontii. 



Style obsolete, or at least shorter than the width of the wing-margins; annuals or bi- 

 ennials. 

 Wing-margins of the fruit not produced at the apex into distinct lobes or teeth. 

 Pods glabrous or rarely minutely puberulent when young. 



Petals conspicuous, at least equalling the sepals, spatulate or obovate. 



