ROSACK^:. (UOSK FAMILY.) 147 



Trtbe II. POTERIEjE. Pistils 1-4, one-ovuled, becoming acheni.i, and enclosed io 

 the urii-sliiipcil tubu of the dry persistent calyx, wliicli is constricted or nearly closed at the 

 tlii-..at I'l t .Is .ifien wautini; 

 4 Pi>t< i-iiiin. IVtals none. Loljes of the calyx 4, petal-like. Style terminal : stigma tufted. 

 5. Alt litiiiillii. I'etuls none. Suimeiis anil pistils 1 -4 : style lateral. 

 6 A^i^riinoiiia. I'etala 5. SUmens 1-2 - 15. I'istils 2 : style terminal. 

 Tribe III. DKYAUKiS. Pistils numerous, rarely few or single, one-ovuled, becoming 

 liry aclKMiia ; the calyx open, not tlesliy in fruit. Petals present, usually conspicuous. 



7. Drjns. Petals and calyx-lobes 8 or 9. Stamens and carpels numerous: persistent 



styles becomin(f lonj; plumose tails in fruit. 



8. Gviiin. lVt;ils and calyx-lobes 5, the latter usually with 5 alternating small bractleU. 



Stamens and carpels numerous : persistent styles becoming long jilumose or hairy, or 

 naked and straight or jointed, tails. Radicle inferior. 



9. 'WaltUteiitia. Petals and calyx-lobes 5 ; no bractlets. Stamens numerous. Achenia 



2- 6 : styles deciduous from the base. Radicle inferior. 



10. Siblialilia. Petals minute : stamens and achenia 5 -10 : otherwise same as Potentilla. 



11. A.'uleiitilla. Petals 5 (rarely 4), conspicuous. Calyx-lobes as many, and also with an 



altirnating set of accessory lobes or bractlets. Stamens and achenia numerous ; the 

 latter heaped on a dry receptacle. Styles commonly more or less lateral, deciduous or 

 not enlarging in fruit. Radicle superior. 



12. Frugaria. Flower as in Potentilla. Receptacle much enlarged and pulpy in fruit. 

 Tribe IV. RUBB.^. Pistils numerous or several, 2-ovuled, becoming berry like or 



druiK-lets in fruit ; the 5-cleft calyx not bracteolate, open, persistent or withering beneath 

 the fruit. Petals conspicuous. 



13. Dallbartla. Carpels 6 - 10, in the bottom of the calyx, almost dry. 



14. Kubiis. Carpels numerous, heaped on the receptacle. 



Tribe V. ROSEiE. Pistils numerous, one-ovuled, becoming achenia, contained in the 

 urn-shaped or globular and almost closed fleshy tube of the caly.\, or hip : no bractlets. 

 Petals c inspicuous. 



15. llosa. Character of the Tribe. 



SuBOftDF.R III. POItlE.E. (Pkar Family.) 

 Caly.x-tube thick and flesliy in Irnit, including and combined with the 

 2-5 ovaries (forming a, pome). Stipules free. 



• Cells of the compound ovary as many as the styles (2 5), each 2- (rarely several-) ovuled. 



16. Crata;gus. Pome drupe-like, with 1 -6 bony stones or kernels. Usually thorny. 



17. Py rus. Pome containing 2 - 5 papery or cartilaginous carpels. 



* Cells of the compound ovary becoming twice as many as the styles, each 1-ovuled. 

 13. Aiuelaiifblcr. Pome usually of 5 carpels ; each becomes incompletely 2-celled by a 

 projection from its back : otherwise as Pyrus. 



1. PRUNUS, Tourn. Plum, Cukrey, &c. 



Caly.x 5-cleft ; the tube bcll-shapod, urn-.shaped or ttdiular-obconical, decidu- 

 ous after flowerin":. Petals 5, spreading. Stamens l.")-20. Ovary .solitary, 

 with 2 penduloua ovules. Drtipc fleshy, with a l>ony stone. — Small trees or 

 shrubs, with mostly edible fruit. (The ancient Latin name.) 

 § 1. PKUXUS & Ci<:RASUS, Tomn. Drupe swoolh, and the stone smooth or 

 somewhat rnijijal : jloWivs {iisiuilli/ whi'tr) /rum se/Hirate Intend sndi/ buds in 

 eurlif spriiu/, precedimj or coetinicous with the Imres ; the pedicels ft w cr seiynd 

 in simple umbel-like clusters. — T/ie Pjlusis of the Old World have the leavef 



