Jones: Flora of Illinois, 83. Rosaceae 147 



2. Ovary and fruit smooth; calyx-lobes equalling or exceeding the tube. 

 3. Stamens exserted; flowers greenish while; spines 5-15 mm. long; woods 

 and river banks, centr. and n. 111. Apr.-May. The common goose- 

 berry in 111. \^R. gracile sensu Pursh, non Michx.} 



R. missouriense Nutt. 



3. Stamens included; flowers green or purplish; spines 3-8 mm. long; 

 swamps and bogs, n. III. May- June. \_R. oxyacanthoides sensu auth., 



non L.] Wild Gooseberry R. hirtellum Michx. 



1. Branches not at all spiny or prickly. 



4 . Leaves minutely resinous dotted and more or less pubescent beneath; 

 flowers greenish white; calyx campanulate; fruit black; thickets and 

 moist woods, common as far s. as Christian Co. May-June. [^R. flori- 



dum L'Her.} American Black Currant R. amencanum Mill. 



4. Leaves not resinous dotted; shrubs escaped from cultivation. 



5. Flowers greenish; calyx saucer-shaped; fruit red; native of Eur. \R. 



rubriim sensu auth., non L.] Garden Currant R. sativum Syme 



5. Flowers yellow; calyx tubular; fruit black; cultivated ground and road- 

 sides, occasional; native of centr. U.S. {^R. aureum sensu auth., non 

 Pursh} Bufl-alo Currant R. odoratum Wendl. 



81. Hamamelidaceae Lindl. — Witch-hazel Family 



1. Leaves palmately veined and lobed; flowers apetalous L Liquidambar 



1. Leaves pinnafely veined, wavy-toothed; petals linear, yellow 2. Hamamelis 



1. Liquidambar L. — Sweet-gum 



L. stryaciflua L. Swampy woods, s. 111., extending northw. to Crawford 

 Co. Apr.-May. 



2. Hamamelis L. — Witch-hazel 



H. virginiana L. Woods, local; n. 111., extending southw. to Peoria and 

 Tazewell counties. Oct. 



82. Platanaceae Lindl. — Plane-tree Family 



1. Platan US L. — Plane-tree 



P. occidentalis L. Sycamore. In woods and along streams, common 

 throughout III. May. 



83. Rosaceae Juss. — Rose Family 



{Malaceae Small ; Drupaceae DC.) 

 1 . Trees and shrubs. 



2. Pistils several to many, simple, or pistil one, compound. 



3. Pistils 2-many, simple, superior; fruits achenes, drupelets, or follicles. 



4. Pistils 2-5, each becoming a 2-4-seeded follicle; shrubs with simple, serrate 

 to entire, or slightly lobed leaves. 

 5. Leaves palmately shallowly lobed; carpels 2-5, somewhat inflated at matur- 

 ity; pubescence of stellate hairs 1. Phvsocarpus 



5. Leaves serrate to entire; carpels 5-8, not inflated; pubescence of simple hairs, 

 or plant glabrous 2. Spiraea 



