146 American Midland Naturalist Monograph No. 2 



2. Leaves pilose beneath; petals white, longer than the elliptical sepals; fila- 

 ments filiform; moist shaded sandstone cliffs, rare. Jackson Co.; La 

 Salle, Ogle, and Jo Daviess counties. May S. forbesii Vasey 



2. Leaves glabrous or nearly so beneath; petals greenish, equalling the deltoid 



sepals; filaments subulate; meadows, local. May-Juni'. 



S. pennsylvanica L. 



L Sepals ascending; plants 8-30 cm. tall; leaves 2-10 cm. long, dentate or 

 crenate; rocky bluffs. Reported from s. Ill S. virgitiiensis Michx. 



78. Escalloniaceae Dum. — Escallonia Family 

 (Iteaccae Agardh) 



1. Itea L. 

 /. virginica L. Virginia Willow. Swamps, rare, s. 111. May-June. 



79. Hydrangeaceae Dum. — Hydrangea Family 



1 . Flowers all fertile, solitary, or in cymes or racemes; stamens 15-60 1. Philadelphus 



1. Flowers in terminal corymbs, of 2 kinds, the marginal ones usually enlarged and 

 sterile; stamens usually 10 2. Hvidrangea 



1. Philadelphus L. — Mock-orange 



1. Sepals glabrous outside. 



2. Flowers usually solitary or 2 or 3 together, scentless; sepals 5-7 mm. long, 

 about equalling the calyx-tube; twigs glabrous; cult, and occasionally 



escaped; native southeastw. May. Scentless Mock-orange 



...P. inodorus L. 



2. Flowers in 5-9-flowered cymes, very fragrant; sepals 12-15 mm. long, ex- 

 ceeding the calyx-tube; twigs pubescent; commonly cult., and sometimes 



escaped; native of Eur. May-June. Sweet Mock-orange 



P. coronarius L. 



1. Sepals pubescent outside; flowers scentless or slightly fragrant, in 5-7-flow- 

 ered cymes; indigenous on the rocky bluffs of the Ohio River near Gol- 

 conda, Pope Co., E. ]. Palmer 15438, 19581; collected in June 1919. and 

 Oct. 1920; not otherwise known P. verrucosus Schrad. 



2. Hydrangea L. 



H. arborescens L. Wild Hydrangea. Ravines and wooded banks, through- 

 out 111., except the n. part. As here treated including var. oblonga T. & G. 

 with leaf-blades tapering at base, and var. deamii St. John (H. cinerea 

 Small), with the blades more pubescent beneath. 



80. Grossulariaceae Dum. — Gooseberry Family 



1. RiBES L. — Gooseberry. Currant 

 (Crossitlaria Mill.) 

 1. Branches usually with spines or prickles. 



2. Ovary and fruit setose; calyx-lobes shorter than the tube; woods and river 



banks. Apr. -May. [^R. gracile Michx.} Pasture Gooseberry 



R. cynosbati L. 



