130 kosaoe.t:. (rosk faaiilv.) 



= = Seeds suBpendod or ajsceiiding. 



12. POTENTILLA. RerepUcIe flnt or convex, dry. 



13. KK.\(iAKIA. K«'ci'i)tiu-lf conical, uiilurKi-d and fli'Hliy in fruit. 



vf 44 -M. Calyx oiH-n, brnctless. StamenH and juicy adicnia numerous. 



14. RUBUS. Aclienia crowded on the conical receptacle. 



*- — Calyx tube tlesliy, urn-shaped ; tlie lobes imbricated in the bud. Achenia numerous, 

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



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



SinoKDKK IV. I'O.MEyE. VaUx includiiijj; ami colieriiif; with tlic 1 - .'> 

 ovaries, very tliick aiul tlesliy in fruit. 



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



17. PYRUS. Fruit of 2 - 5 cartilaRinous or membranaceous 2-seeded cells. 



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



1. CHRYSOBALANUS, L. 



Calyx bell sliaped, r)-cleft, peisi.steiit. Petals .'i. 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. Le.aves nearly sessile, entire, with minute stipules. Flowers 

 small, in axillary nr tormiiial paniculate cymes. 



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

 smooth on botii sides, or hoary-])ubescent 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' - 1 2' high. Leaves 3' - 4' long. Flowers greeni.^h w hite. 



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. PRUNUS, L. Plum, Cherry. 



Calyx .5-cleft, deciiluous. Petals 5, spreading Stamens l.')-.30. Ovary 

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

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



§ 1. Puuxus. (Plu^i.) — Drupe glaucot's : stone move or less compressed: 

 haves convolute in the bud : Jioicers in lateral clusters, aji]iearing before the 

 leaves: branches often Sj)ini/. 



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

 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, |'-1' in diameter, pleasantly acid, ripening in 

 September. 



2. P. umbellata, Fll. 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 



