ORDER 44 ROSACES. 101 



ORDER XLIV. ROSACES. ROSEWORTS. 



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

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

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

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

 Ovaries 1, 2, 5, or oo, 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, 251, 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 Ovary inferior, and the fruit enclosed in the calyx tube...(m) 



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



a Carpels 2 OO . Calyx persistent, bractless. Shrubs or herbs. . .(<-) 



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



b TRIBE I. CHRYSOBALANE^E. Style lateral. Ovules 2, ascending CHRYSOBALAinTS. 



b TKIBE II. AMYGDALEjE. Style terminal. Ovules 2, pendulous PRUNUS. 



e TRIBE III. SPIR^EE^E. Carpels 28, several-seeded follicles in fruit... (rf) 



d Petals obovate, equal, imbricate in the bud SPIR.SA. 



d Petals lance-linear, convolute in the bud GILLENIA. 



e TRIBE IV. RDBE^E. Carpels 2 00, 1-seeded drupes or achenia.... (e) 



e Shrubs unarmed. Carpels 58. Petals 5 (or 00 ), yellow KERRIA. 



e Shrubs unarmed. Carpels 2 4. Petals 0. Calyx leafy NEVIUSIA. 



e Shrubs prickly. Carpels OO, drupaceous and juicy RPBUS. 



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



/ TRIBE V. FRAGARIDEJ3. Carpels 4 00, 1-seeded achenia in fruit... (g) 



q Style persistent on the dry acheni a. h Petals 8or9 D RTAS. 9 



A Petals 5 GEUM. 10 



g Style deciduous. Jc Torus pulpy, globular, red FRAGARIA. 11 



7* Torus spongy or dry. I Bractlets minute or 0. WALDSTEINIA. 12 



I Bractlets 5 POTENTILLA. 13 



m TRIBE VI. SAXGUISORBE^E. Carpels 13, acheniate. Petals or 5. . .(n) 



n Stamens 14. Style lateral. Flowers apetalous, scattered ALCHEMILLA. 14 



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



n Stamens 10 15. S%les 2. Petals 5, yellow AGRIMONIA, 16 



m TRIBE VII. ROSE^E. 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 AMELANCHIER. 18 



o Petals roundish. p Carpels 1-seeded CRATJEGUS. 19 



p Carpels 2-seeded PYRUS. 20 



p Carpels CO -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. J) With 

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



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

 calyx tomentous-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, Tourn. PLUM, &c. Calyx 5-cleft, the tube bell-shaped 

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

 with 2 pendulous ovules. Drupe fleshy, with a bony nucleus. 5 1> Fruit 

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



