ROSE FAMILY 155 



COLEOGYNE Torrey 1853 

 (Gr. koleos, sheath, gyne, pistil) 



Sepals 5, petals 5, yellow, stamens many, style lateral, hairy at base, 

 achene somewhat flattened, smooth; flowers terminal; leaves simple, leath- 

 ery; somewhat spiny shrub. 

 Stems much branched; leaves linear-oblanceolate ; 



flowers showy C. ramosissima 



COM ARUM Linne 1753 

 (The Greek name of the arbutus) 



Sepals 5, united, with 5 bracts between them, petals 5, purple, stamens 

 many on a hairy disk, pistils many, style lateral, achenes smooth, 1-seeded; 

 flowers in cymes or solitary, terminal or axillary; leaves alternate, pinnate; 

 perennial. 

 Stems prostrate ; leaflets oblong to oval, 1-3 cm. long ; 



flowers 2-3 cm. wide C. palustre 



COWANIA Don 1825 CLIFF ROSE 



(Named for Cowan, an English explorer) 



PL 26, fig. 9. 



Sepals 5, united into a top-shaped calyx, petals 5, yellow, stamens 

 many, inserted in 2 rows with the petals on the calyx-tube, pistils about 5, 

 hairy, partly enclosed in the calyx-tube, styles becoming long plumy tails; 

 flowers solitary or few in a cluster, terminal ; leaves simple, leathery ; shrub. 

 Stems .5-3 ft. high; leaves wedge-shaped, whitish be- 

 low, .5-1 cm. long; flowers about 1 cm. wide C.mexicana 



DASYPHORA Rafinesque 1838 



(Gr. dasys, hairy, phora, bearing, perhaps from the shaggy achenes) 



PL 25, fig. 5. 



Sepals 5, united into a salverform calyx with 5 alternating bractlets, 

 petals 5, yellow, stamens about 20, style club-shaped, glandular above, in- 

 serted near the base of the ovary, stigma 4-lobed, achenes densely woolly 

 as also the receptacle ; flowers terminal, solitary or in few-flowered cymes ; 

 leaves pinnate of 5-7 leaflets; shrub. 

 Stems erect, .5-6 ft. high, rarely prostrate ; leaflets ob- 

 long to oblanceolate, 1-3 cm. long; flowers 1.5-3.5 

 cm. wide D. fruticosa 



