MUSTARD FAMILY 21 



dense cor) nibs or raceme^ ; leaves gray-hairy, wavy-toothed or lobed ; peren- 

 nial. 

 Stems erect, densely white-hairy ; leaves ovate to 



lanceolate D. Wislizenii 



Draba Linne 1753 Draba 



(Gr. drabe, a plant of the mustard family) 



PL 5, fig. 5 ; pi. 6, fig. 18-20. 



Sepals 4, petals 4, yellow, yellowish or white, stamens 6, pod ovoid 

 to oblong or linear-oblong, fiat, few-many-seeded, style usually short ; flow- 

 ers in racemes or corymbs; leaves simple, entire or toothed; annual, biennial 

 or perennial. 



1. Annuals 



a. Flowers white 



I 1 ) Puds in an umbel-like cluster ; leaves en- 

 tire D. carolinidna 

 (2) Pods in a raceme; leaves usually toothed D. cuneijolic, 



b. Flowers yellow or white 



(1) Plant low, 5-10 cm. high, smooth; leaves 



basal D. crassifolia 



I 2 ) Plant 10-30 cm. high, hairy ; stem leafy, 



at least below D. nemorosd 



2. Perennials, as shown by the ruotstock or the old 



stem or leaf bases 



a. Flowering stems leafless, tufted; flowers yel- 



low to white 



(1) Leaves ovoid to spatulate ; pods oblong D.ventosa 



(2) Leaves linear to linear oblong; pods ovoid D. oligospermia 



b. Flowering stems leafy 



(lj Flowers white D.incana 



{2) Flowers yellow 



(a) Pods smooth, straight D. chrysdntha 



I h 1 Pods hairy, twisted 



Stem and leaves with long spreading 

 hairs D. streptocdrpa 



y. Stem and leaves gray with close hairs D.aurea 



Erysimum Linne 1753 Erysimum, Wallflower 



(Gr. erysimon, hedge-mustard, transferred from another plant) 



PI. 5, fig. 4; pi. 6, fig. 28-29. 



Sepals 4, petals 4. yellow, orange or purple, pod linear, 4-sided, seeds 



