24 MUSTARD ORDER 



in 1 row, style stoutish, stigma 2-lobed ; flowers in racemes or corymbs ; 

 leaves entire, sinuate-toothed or lobed, often gray-hairy; annual, biennial 

 or perennial. 



1. Flowers small, petals 3-6 mm. long; pods 1-2.5 



cm. long E. c heir ant hoides 



2. Flowers medium to large, petals 6-20 mm. long; 



pods 3-20 cm. long 

 a. Annual or biennial, i. e., no old woody stems 

 present 



(1) Petals 6-10 mm. long; pods 3-8 cm. long E. parvvHorum 



(2) Petals 12-20 mm. long; pods 5-20 cm. long E. aspernm 

 . b. Perennials, i. e., bases of former stems usually 



evident 



(1) Flowers yellow; plant low, 2-6 in. high E.nivdle 



(2) Flowers orange to brownish-orange, or 



rose-purple ; plant 6-16 in. high E. Wheeleri 



Hutchinsia Robert Brown 1812 



(Named for Miss Hutchins, an Irish botanist) 



PI. 6, fig. 4. 



Sepals 4, petals 4, white, stamens 6, pod more or less elliptic, flattened 

 at right angles to the partition, slightly notched, several-seeded, style short 

 or none; flowers in racemes; lower leaves 3-forked or pinnatifid ; annual. 

 Stems low, branched, spreading, hairy, 3-8 in. tall H. procumbens 



Lepidium Linne 1753 Pepperweed, Peppergrass 



(Gr. lepidion, little scale, from the pods) 



PI. 6, fig. 1-2. 



wSepals 4, petals 4 or none, white or greenish, stamens 2 or 6, rarely 4, 



.^tyle short or none, pod more or less circular, much flattened, usually 



notched at the top, often winged ; flowers in dense often spike-like racemes ; 



leaves entire to pinnatifid, especially the basal ; annual, biennial or perennial. 



1. Stamens 6 



a. Leaves entire or toothed, oblong-ovate L. drdba 



b. Leaves pinnatifid, or narrow when entire 



(1) Some or all the leaves narrow and entire, 

 the basal ones usually pinnatifid 



(a) Pods broadly rounded L. Fremontii 



(b) Pods ovoid L. alyssoides 



