130 ROSACEJE. (ROSE FAMILY.) 



= Seeds suspended or ascending. 



12. POTENTILLA. Receptacle flat or convex, dry. 



13. FRAGARIA. Receptacle conical, enlarged and fleshy in fruit. 



++ ++ Calyx open, bractless. Stamens and juicy achenia numerous. 



14. RUBUS. Achenia crowded on the conical receptacle. 



i- H- Calyx tube fleshy, urn-shaped ; the lobes imbricated in the bud. Achenia numerous, 

 inserted on the receptacle which Hues the inside of the calyx tube. 



15. ROSA. Achenia dry and hairy. Prickly shrubs. 



SUBORDER IV. POME^E. Calyx including and cohering with the 1-5 

 ovaries, very thick and fleshy iu fruit. 



1C. CRAT.EGUS. Fruit of 1 -5 bony 1-seeded nutlets. 



17. PYRUS. Fruit of 2 - 5 cartilaginous or membranaceoua 2-seeded cells. 



18. AMELANCHIER. Fruit of 3 - 5 2-seeded cells ; seeds separated by a false partition. 



1. CHRYSOBALANUS, L. 



Calyx bell shaped, 5-cleft, persistent. Petals 5. Stamens about 20 ; the 

 inner ones often shorter and sterile Ovary with 2 collateral erect ovules ; 

 the style arising from its base. Drupe 1-seeded; the stone grooved. Un- 

 armed shrubs. Leaves nearly sessile, entire, with minute stipules. Flowers 

 small, in axillary or terminal paniculate cymes. 



1. C. oblongifolius, Michx. Leaves somewhat coriaceous, oblong, 

 smooth on botli sides, or hoary-pubescent beneath, deciduous ; cymes many- 

 flowered ; stamens and ovary smooth ; drupe ovoid. Dry sandy pine bar- 

 rens in the lower districts. May. Stems creeping, the flowering branches 

 6' -12' high. Leaves 3' -4' long. Flowers greenish white. 



2. C. Icaco, L. (CocoA PLUM.) Leaves round-obovate, smooth, coria- 

 ceous; cymes few-flowered; stamens and ovary hairy; drupe large, roundish. 

 South Florida. Shrub 4 -12 high. Leaves 2' long, 1|' wide. Drupe 

 yellow, purple, or black. 



2. PRUNTJS, L. PLUM, CHERRY. 



Calyx 5-cleft, deciduous. Petals 5, spreading. Stamens 15-30. Ovary 

 with 2 collateral suspended ovules. Style terminal. Drupe fleshy ; the 

 stone even. Trees or shrubs. Leaves simple. Flowers white. 



1. Pituxus. (Pi.UM.) Drupe glaticoi's : stone more or less compressed: 

 leaves convolute in the bud : flowers in lateral clusters, appearing before t/te 

 leaves : branches often spiny. 



1. P. Americana, Marsh. Leaves thick, ovate or somewhat obovate, 

 acuminate, rounded or slightly cordate at the base, pubescent beneath, sharply 

 serrate, on glandular petioles ; drupe large, globose. Woods. March - 

 April. A small tree. Leaves 2' -3' long, smooth when old. Flowers very 

 numerous. Plum reddish, \' -\' in diameter, pleasantly acid, ripening in 

 September. 



2. P. umbellata, Ell. Leaves thin, ovate-lanceolate or oblong, acute 

 at both ends, or the upper ones rounded at the base, finely and sharply serrate, 

 smooth, or soft-downy beneath; calyx teeth emarginate, pubescent; drupe 



