162 ROSE ORDER 



PURSHIA DeCandolle 1816 



(Named for Pursh, an early American botanist) 



PI. 26, fig. 6. 



Sepals 5, united into a funnel-shaped calyx, petals 5, yellowish, stamens 

 about 25 in 1 row, inserted with the petals on the calyx, pistils 1 or some- 

 times 2, fruit soft-hairy, tapering at both ends, exserted; flowers solitary 

 or clustered, terminal; leaves clustered, simple, lobed; low shrub. 

 Stems prostrate or erect, 1-5 ft. high ; leaves spatulate 

 or wedge-shaped, 3-lobed, white-hairy beneath, 5-15 



mm. long P. tridentdta 



ROSA Linne 1753 ROSE 



(Lat. rosa, rose) 



PL 25, fig. 1. 



Sepals 5, united into a cup- or urn-shaped calyx, petals 5, white, pink 

 or red, stamens many, inserted on a hollow disk, pistils many, hairy, becom- 

 ing achenes enclosed in the berry-like calyx-tube or hip; flowers solitary 

 or in corymbs; leaves alternate, odd-pinnate; erect or climbing usually 

 prickly shrub. 



1. Flowers usually several in a corymb; leaflets 



mostly 9-11 R. arkansdna 



2. Flowers usually solitary; leaflets mostly 5-7 



a. Stems with 2-3 larger conspicuous spines at 



base of the leaf stalk 



(1) Flowers 3-5 cm. wide; fruits 7-10 mm. 



wide R. Woodsii 



(2) Flowers 5-8 cm. wide; fruits 12-20 mm. 



wide, often prickly R. nutkdna 



b. Stems very spiny, but without larger conspicu- 



ous spines at the base of the leaf stalk ; fruit 



globose to pear-shaped R. aclculdris 



RUBUS Linne 1753 RASPBERRY, BLACKBERRY 



(Lat. name of the bramble, from ruber, red) 



PL 26, fig. 3. 



Sepals 5, united into a short broad tube, petals 5, mostly white, stamens 

 many, inserted on the calyx, pistils many, rarely few, inserted on a convex 

 or elongated receptacle, ripening into little drupes and forming an aggre- 

 gate fruit, style nearly terminal; flowers terminal or axillary, solitary or 



