28 MUSTARD ORDER 



Streptanthus Nuttall 1838 s 



( Gr. streptos, twisted, bent, anthos, flower) 

 (Euklisia Rydberg) 

 PL 6, fig. 43. 



Sepals 4, petals 4, white, yellow or purple, stamens 6, pod linear or 

 linear-oblong, flat, sometimes beaked, seeds in 1 row ; flowers in racemes ; 

 leaves simple to pinnatifid, often clasping; annual, biennial or perennial. 



1. Stem leaves clasping, ovoid to oblong, usually 



entire ; pods blunt, ascending or spreading 5. corddtus 



2. Lower stem leaves not clasping, often petioled, 



lance-oblong, pinnatifid ; pods beaked, reflexed S. longirostris 



Subularia Linne 1753 Awlwort 



(Lat. subula, an awl, from the shape of the leaves) 



PL 6, fig. 11. 



Sepals 4, petals 4, white, stamens 6, pod oblong to elliptic, short-stalked, 

 seeds few, in 2 rows in each half, style none ; flowers few in a raceme ; 

 leaves basal, awlshaped : annual submerged aquatic. 

 Plants tufted in shallow water or in mud, 1-3 in. high S. aqudtica 



Thelypodium Endlicher 1842 



(Gr. thelys, female, podion, little foot, from the stalked ovary) 



PL 6, fig. 31, 32. 



Sepals 4, petals 4, white to purple or yellow, stamens 6, pod linear, 

 long, round or 4-angled in section, sometimes with a short base or stalk, 

 style short ; flowers in dense corymbs or racemes ; leaves usually entire, 

 sometimes toothed or lobed ; annual, biennial or perennial. 



1. Flowers white or purple 



a. Stem leaves clasping by an eared base T. sagittdtutn 



b. Stem leaves not clasping 



(1) Stem leaves distinctly petioled, broad, 



toothed or lobed T. Wrightii 



(2) Stem leaves sessile or nearly so, narrow 



and entire T. integrifolium 



2. Flowers yellow ; leaves clasping T. aureum 



Thlaspi Linne 1753 Pennycress 



(Gr. thlaspi, cress, from thlao, crush) 



PL 6, fig. 5-6. 



Sepals 4, petals 4, white, stamens 6, style sometimes very short, pod 



