186 ROSE ORDER 



b. Plants with fine, closely appressed hairs 



( 1 ) Plants low, nearly stemless P. mephitica 



(2) Plants 1-2 ft. high P. cuspiddta 



ROBINIA Linne 1753 LOCUST 



(Named for the brothers Robin) 



PI. 28, fig. 7. 



Sepals 5, united into a tube, the 2 upper teeth also somewhat united, 

 petals 5, white to rose, standard large, reflexed, stamens 10, 9 united, ovary 

 stalked, ovules many, pod linear, flat, opening by 2 valves; flowers in axil- 

 lary or terminal racemes; trees or shrubs with odd-pinnate leaves. 

 Shrubs 3-15 ft. high; leaflets oblong to elliptic; clus- 

 ters large; flowers 15-25 mm. long R. neo-mexic&na 



SOPHORA Linne 1753 SOPHORA 



(From the Arabic word for yellow) 



PL 29, fig. 3. 



Sepals 5, united into a bell-shaped tube, petals 5, white, stamens 10, 

 distinct from each other or nearly so, ovary short-stalked, ovules many, 

 pod stalked, terete, constricted between the seeds, usually remaining closed; 

 flowers in terminal racemes or panicles ; leaves odd-pinnate ; perennial. 

 Stems 4-12 in. high; leaflets oblong to obovate, 5-15 



mm. long; flowers 15-16 mm. long 5*. sericea 



THERMOPSIS R. Brown 1811 THERMOPSIS 

 (Gr. thermos, lupine, opsis, likeness) 



PL 27, fig. 1. 



Sepals 5, united, the 2 upper ones also sometimes united with each 

 other, petals 5, yellow, stamens 10, separate, ovary sometimes short-stalked, 

 ovules many, pod linear to oblong, flat, straight or curved; flowers in 

 terminal or axillary racemes ; leaves alternate of 3 leaflets ; perennial. 



1. Pods erect or ascending, straight or slightly curved T. inontdna 



2. Pods horizontal, reflexed, strongly curved T. rhombifolia 



TRIFOLIUM Linne 1753 CLOVER, ALSIKE 

 (Lat. tri-j three, folium, leaf) 



PL 28, fig. 3, 5. 



Sepals 5, united into a bell-shaped calyx, petals 5, white, pink, red or 

 yellow, usually persistent, stamens 10, 9 united, pod usually not splitting, 

 1-6-seeded ; flowers in dense heads or spikes, often with an involucre ; leaves 

 of 3 leaflets, the latter toothed ; annual or perennial. 



