194 ROSE ORDER 



petals 5, white or cream-colored, stamens with anthers 5, imperfect stamens 

 or staminodia usually many in clusters at the base of each petal, ovary 

 1-celled, ovules many, stigmas usually 4, capsule 1-celled, opening by 4 

 valves ; flowers solitary, terminal ; leaves mostly basal entire ; perennial. 



1. Petals fringed on the edges, with a short claw or 



stalk P. fimbriate! 



2. Petals not fringed and without a claw 



a. Leaves all basal ; sterile stamens 3-5 in a clus- 



ter p. Kotzebuei 



b. Stem bearing a leaf near the middle ; sterile 



stamens 5-15 in a cluster 

 ( 1 ) Petals 5-8 mm. long ; leaves tapering at 



base P. parviflorQ 



(?) Petals 10-12 mm. long; leaves heart-shaped 



at base P. palustris 



Philadelphia Linne 1753 Mock Orangf 



(Gr. philadelphon, a sweet-flowering shrub) 



PI. 31, fig. 10. 



Sepals 4-5, united into a top-shaped calyx, grown to the ovary, petals 

 4-5, white, separate, stamens 20-40, ovary 3-5-celled, styles 3-5, separate or 

 united at base, capsule top-shaped, splitting by 3-5 valves ; flowers solitary or 

 clustered, terminal or axillary ; leaves opposite, simple ; shrub. 

 Leaves smooth or hairy, 1-3 cm. long; flowers 2-3.5 



cm. wide P. microphallus 



Ribes Linne 1753 Currant, Gooseberry 



(From the German riebs, gooseberry) 



PI. 30, fig. 4, 6; pi. 31, fig. 12, 13.' 



Sepals 4-5, united into a cylindric-, saucer-, or bell-shaped calyx, green, 

 white, pink or yellow, petals 4-5, stamens 4-5, inserted with the petals on 

 the throat of the calyx, ovary 1-celled, styles 2, separate or united, fruit a 

 berry; flowers in racemes or 1-few in axillary clusters; leaves alternate, 

 often clustered, usually lobed ; shrubs. 

 1. Stems prickly, and often bristly 



a. Flower saucer-shaped ; berry usually bristly, 



red or black R. lacustre 



b. Flower bell-shaped to tubular; berry usually 



smooth 

 (1) Calyx hairy R.leptdnthum 



