ORDER 44. ROSACES. 101 



ORDER XLIV. ROSACEJ3. ROSEWORTS. 



Herb*, shrubs, or trees, with alternate, stipulate leaves and regular flow- 

 ers. Sepals 5, rarely fewer, united, often re-enforced by as many bractlets. 

 Petal? 5, rarely 0, distinct, inserted on the disk which lines the calyx tube. 

 Stamens GO, rarely few, distinct, inserted with the petals (perigynous) 

 Ovaries 1,2,5, or GO, distinct, or often coherent with each other, or im- 

 mersed in the tube of the calyx. Fruit a drupe, or achenia, or a dry or 

 juicy etserio (\ 158), or pome. Seeds 1 or few in each carpel, anatropous, 

 exalbuminous. Embryo straight. Figs. 5, 35, 38, 117, 139, 158, 183-5, 188, 

 197, 244, 231, 285, 297, 300-1, 307, 358, 365-6, 400, 428. 



A Ovary superior, and the fruit not enclosed in the tube of the calyx... (a) 

 A Ovary inferior, and the fruit enclosed in the calyx tube...(m) 



o Carpel 1, forming a drupe in fruit. Calyx deciduous. Trees or shrubs. . .(6) 



a Carpels 2 GO. Calyx persistent, bractless. Shrubs or herbs... (e) 



a Carpels 4 GO. Calyx persistent, with 5 bractlets added. Herbs mostly. ..(/) 



6 TRIBB I. CHRYSOBALANEjE. Style lateral. Ovules 2, ascending CHRYSOBALAKCS. i 



b TRIBE II. AMYGD ALE.*. Style terminal. Ovules 2, pendulous PRUNUS. 3 



r TRIBE III. 8 PIRJEEjE. Carpels 28, several-seeded follicles in fruit... (rf) 



d Petals obovate, equal, Imbricate in the bud , SPIK.HA. 3 



d Petals lance-linear, convolute in the bud i i i i.i. KM A. 4 



< TRIBE IV. RUBEjE. Carpels 2 00, 1-seeded drupes or achenia (e) 



e Shrubs unarmed. CarpelsSS. Petals 5 (or 00), yellow KKRRIA. 5 



e Shrubs unarmed. Carpels 2 I Petals!). Calyx leafy NKVIUSIA. 6 



Shrubs prickly. Carpels 00 , drupaceous and juicy RUBUS. 7 



e Herbs not prickly. Carpels 510 (26 in No. 12), dry DALIBARDA. 8 



/ TRIBE V. FRAOARIDE/E. Carpels 4 OO, 1-seeded acheuia in fruit.. .(g) 



if Style persistent on the dry achenia. h Petals8or9 DRTAS. 9 



A Petals 5 GEUM. 10 



g Style deciduous. k Torus pulpy, globular, red FRAQARIA. 11 



k Torus spongy or dry. 1 Bractlets minute orO. WALDSTEIPUA. 12 



I Bractlets 5 POTENTILLA. 13 



m TRIBE VL SANGUISORBEjE. Carpels 13, acheniate. Petals or 5...() 



n Stamens 1 i. Style lateral. Flowers apetaloiis, scattered ALCHKMILLA. 14 



n Stamens 4 00. Style terminal. Flowers apetalous, spicate POTKRIUM. 15 



n Stamens 10 15. Styles 2. Petals 5, yellow AURIMO.NIA. 16 



m TRIBE VII. ROSEAU. Carpels 00, 1-seeded, free in the calyx tube ROSA. 17 



m TRIBE VIII. POMEyE. Carpels 25, consolidated with the calyx tube. . .(o) 



o Petals oblong-spatulate. Carpels half-2-celled AMELANCHIEB. 18 



o Petals roundish. p Carpels 1-seeded ,(,'RAT.+:GCS. 19 



p Carpels 2-seeded PYRUS. 20 



p Carpels 00 -seeded CYDONIA. 21 



1. CHRYSOBALANUS, L. COCOA PLUM. Calyx 5-cleft. Pet, 5. Sta. 

 about 20, in a single series. Ov. solitary, sessile, the style arising from the 

 base. Ovules 2, collateral. Drupe 1-seeded, with thin pulp. 5 With 

 entire, veiny leaves, minute stipules, and terminal panicles. 



C. oblotijfifoliii* MX. Lvs. oblong, varying to oblanceolate, subsessile, pedicels and 

 calyx tomentou?-hoary ; filaments and ovary glabrous ; drupe as large as a plum. 

 Pine-barrens, Ga. Ala. Fla. 8 12f. Leaves shining. Flowers small, white. 



2. PRUNUS, Tonrn. PLUM, &c. Calyx 5-cleft, the tube bell-shaped 

 or cup-shaped, decidu-.us. Pet. 5, spreading. Sta. 15 30. Ov. solitary, 

 with '3 pendulous ovules. Drupe fleshy, with a bony nucleus. J> J> Fruit 

 mostly edible. Fls. white or purplish. Figs. 51, 119-21, 124-5, 158, 285, 297 



