EOS ACE AE. 25 



1. O. stellatus Rydb. Low shrub, with decidedly pubescent foliage: leaf-blades 

 1-4 cm. long: sepals narrowly ovate, 2-2.5 mm. long: follicles mostly 4, about 

 5 mm. long. NINEBARK. 



Woods and banks of streams, n. Fla. (Go.) Spr. 



2. RUBUS [Tourn.] L. Perennial erect or trailing herbs or shrubs. 

 Leaf-blades simple or 3-7-foliolate. Flowers solitary or variously disposed. 

 Carpels borne on a convex or conic receptacle. Fruit hemispheric or elongate, 

 composed of drupelets. Spr. RASPBERRY. BLACKBERRY. 



Shoots of the season erect : stems erect, arching, or recurved. 



Leaves white-tomentose beneath. 1. R. cuneifolius. 



Leaves not white-tomentose beneath. 



Leaves permanently pubescent beneath, at least on the 



veins. 2. R. floridus. 



Leaves glabrous beneath, at least at maturity. 3. R. betulifolius. 



Shoots of the season, and stems, prostrate, the floral branches 



erect. 



Inflorescence not prickly : leaves not persistent. 4. R. rhodophyllus. 



Inflorescence with flattened prickles : leaves persistent. 

 Stem decidedly prickly, not bristly : inflorescence usu- 

 ally several-flowered. 5. R. lucidus. 

 Stem bristly as well as prickly : flowers mostly solitary. 6. R. trivialis. 



1. R. cuneifolius Pursh. Stems biennial, erect, 0.5-1.5 m. high, more or less 

 tomentose, armed with straight or somewhat recurved prickles: leaves of the 

 young shoots pedately 3-5-f oliolate : blades of the leaflets obovate or cuneate- 

 obovate, thick, dark-green and sparingly pilose or glabrate above, white-tomen- 

 tose beneath, finely serrate except towards the acute or cuneate base: floral 

 branches 1-3 dm. long: leaves 1-3-f oliolate ; blades of the leaflets 2-4 cm. 

 long, more cuneate or cuneate-oblanceolate : inflorescence corymbiform, 3-7- 

 flowered, tomentose and prickly: sepals white-tomentose on both sides: petals 

 white, obovate to elliptic, 8-12 mm. long: fruit black, rather dry, but fine- 

 flavored, short-oblong, 10-12 mm. long. LATE-BLACKBERRY. 



Sandy woods, thickets, and fields, n. and pen. Fla. (Cent.) 



2. R. floridus Tratt. Stems biennial, erect, 2-5 m. high, or the branches de- 

 cumbent, more or less angled, armed with stout, flat, strongly curved prickles: 

 leaves of the new stems 3-5 -f oliolate : petioles and petiolules pilose and spar- 

 ingly prickly: blades of the leaflets oblong-lanceolate or ovate-lanceolate, 5-10 

 cm. long, sparingly pubescent above, pale and more densely puberulent be- 

 neath, but in age nearly glabrous except the veins, sharply double-serrate: 

 floral branches short: leaves 3-f oliolate or the upper unif oliolate ; blades of 

 the leaflets smaller, more glabrate, elliptic to rhombic-oval: flowers in rather 

 few-flowered more or less leafy corymbs; peduncles and pedicels densely pubes- 

 cent, sometimes with few scattered glands, but not armed: petals white or 

 pinkish, elliptic-obovate, 12-15 mm. long. 



Pinelands and fields, n. Fla. (Cont.) 



3. R. betulifolius Small. Stems biennial, glabrous, angled, armed with recurved 

 and strongly flattened prickles, erect or recurved-spreading : leaves of the 

 new stems 5-f oliolate; blades of the leaflets oblong-lanceolate, evenly serrate, 

 thin, glabrous on both sides, petioles, petiolules and midveins with very flat 

 recurved prickles, glabrous or nearly so: flowering branches 1-2 dm. long, 

 armed with recurved prickles: leaves 3-f oliolate; blades of the leaflets oval 

 or elliptic, thin, glabrous, evenly serrate, shining above: inflorescence corym- 

 bose, somewhat leafy-bracted below, sparingly pubescent and armed with re- 

 curved prickles: petals white or pale purplish, elliptic-obovate, 12-15 mm. 

 long: fruit rounded or slightly elongate, black. 



Swamps and wet sandy woods, w. Fla. (Cont,) 



4. R. rhodophyllus Rydb. Stems biennial, decumbent, terete, pubescent or in 

 age glabrate, armed with recurved prickles, which are flattened only at the 



