20 MUSTARD ORDER 



tened, seeds several to many in 2 rows, style slender ; leaves entire or 



toothed; annual. 



Upper leaves clasping, arrow-like ; pod margined C. sativa 



Cardamine Linne 1753 Bittercress 



(Gr. kardamine, a cress-like herb) 



PI. 6, r>. 39. 



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

 flat, seeds in 1 row, style short or none ; flowers mostly in corymbs ; leaves 

 entire, lobed or pinnate ; mostly perennial. 



1. Leaves simple, wavy-toothed or entire, smooth 



or hairy C. cordifolia 



2. Leaves pinnatifid or pinnate 



a. Lateral leaflets oblong to linear C. pennsilvdnica 



b. Lateral leaflets round to broadly obovoid C. Breweri 



Caulanthus Watson 1871 



(Gr. kaulos, stem, anthos, flower) 



PL 6, fig. 38. 



Sepals 4, usually purplish, petals 4, greenish-yellow, stamens 6, pod 

 linear, long, nearly round in section, seeds in 1 row, style short ; flowers in 

 racemes ; leaves entire, toothed or lobed ; perennial. 

 Stem usually fleshy and hollow ; flowers ascending to 

 reflexed C. crassicaulis 



Conringia Heister Hare's-ear Mustard 



(Named for Professor Conring) 



PL 6, fig. 27. 



Sepals 4, petals 4, white or cream-colored, stamens 6, pod linear, long, 

 4-sided, seeds in 1 row in each half, beaked; flowers in loose corymbs; 

 leaves entire or wavy, clasping; annual. 

 Leaves oblong to elliptic, glaucous; pods 2-4 in. long C. orientdlis 



Dithyrea Harvey 1845 

 (Gr. di-, two, thyra, door, valve, from the pod) 

 PL 6, fig. 17. 



Sepals 4, petals 4 U yellow to purple, stamens 6, pod of two roundish 

 flattened 1 -seeded disks, resembling eye-glasses, style stout; flowers in 



