ROSACE.^. (^IIOSK FAMILY.) 76 



«• Calyx persistent in fruit : stamens perijfj-nouH : cnriwjU wvenil-»e«de4 



2. Spiraea. Carpels cartilaginous, 1-valved, distinct. Flowers perfect, nuvly polyga. 



nious. Leaves simjile, serrate or incised. 

 •«• •»+ Calyx njanescent in fruit : stamens Iiyj>ojf}'nou8 : cariicls few-seeded 



3. Aruncus. Carpels cartilaginous, 1-valved, distinct. Flowers dia-ciou*. Leaves r»- 



peateilly ternately divided. 

 ■*- ■*- Seeds with shining stony testa: albumen very distinct: stipules mcrabmnacroiu, 



caducous. 



4. Fhysocarpus. Follicles iiienihranaceous, intlated, 2-valved, «listinct, often stipitat« 



Fliiwcrs perfect, corymbose. Leaves lobed. 



• • Caijicls opposite to the calyx-lobes when of the same numl>cr. 

 6. Chainsebatiaria. Follicles coriaceous, 1-valved, connate at ba.sc, Kevend-Ht'edcd. 

 Alliuinin distinct. Flowers perfect Leaves small, coriaceous, stipulate, bipmnalcly 

 dLssected. 



♦ * • Carpel becoming an akene. 



6. Huludiscus. Carpels alternate with the calyx-lobes, with dcn.sely silky styles and i 



collateral jiendulous ovules. Akenes membranous, woully, 1-sceded. Leaves lubed, 

 without stipule.s. 



Tribe II. RUBE.<E. Carpels several or numerous on a spongj* receptacle, becoming 

 drupelets in fruit. Calyx open, without braetlets. Stamens numerous. Ovules 8 

 ami pendulous, but seed solitary. 



7. Rubns. Carpels indetiuitely numerous, berry-like in fruit. Perennial herbs or boft- 



woody shrubs with biennial stems. 



Tribe III. POTENTILLE^. Carpels numerous, several, or solitary, 1-ovulcd, be- 

 coming dry akenes. Calyx not enclosing or at least not con.stricted over the fruit 

 Seed erect or ascending. 



• Slirub-s : carpels mostly solitary : style not elongated in fruit : stigma decurrent : raljTC 



imbricated, without braetlets. Flowers solitary in ours. 



8. Pur.shia. Petals 5. Leaves ;l-(left. Radicle inferior. 



9. Culeogyne. Calyx 4-parted, colored. Petals none. Leaves opposite, small, narrow. 



entire. Radicle superior. 



• * Trees or shrubs : carpels solitary or numerous : styles elongated and plumo.sc in ftiilt : 



calyx imbricated, without braetlets (except in FaUugia) : seed erect. 



10. Cercocarpus. Flowers solitiry, axillary, small. Petals none. Carj^els solitary, 



rarely 2. Calyx-tube long-cylindrical ; the limb deciduous. Leaves simple, entire or 

 toothed. 



11. Cowania. Flowers solitary, short-pednncled. U'rminal. showy. Petals 5. Carpels 



') t' l_'. Calyx short and turbinate. Leaves cunoate, lol>ed. 



12. Fallugia. Flowers somewhat panided, on Ion;; peduncles, showy. Petals .*> CnqH'U 



numerous. Calyx turbinate. Leaves with linear lobes. 



• • • Herbs : cari>els few to many : calyx concave or canipanulate, valvate in the bud. 



bractcolate. 

 •»- Seed erect from the base of the cell : radicle inferior : style strictly tenninal. pensUtcnt. 

 13 Dryas. Like Geum, but petids 8 or 9. 



14. Geiiiu. Carpels very numerous on a dry recei)tacle : the elongated style In fruit raostlv 



geni(;idat« or plumo.se. Potils 5. 

 4- ••- Seed suspended or ascending : radicle sn]>erior : style sm.ill. naked, not prnlrulatr 



15. Frafi:aria. Carpels very numerous, in fruit on a lar^'e tleshy .scarlet rocejitacle. Styles 



latend. Leaves 3 foliolate. 

 10. Potentilla. Petals yellow, rarely white, sessile. Stamens usually CO or more ; flla- 



ments narrow or filiform Carpels mostly numemus, on a drj- receptacle. Leaves 



pinnrite or di'.'itate ; leaflets toothed or cleft, not confluent 

 17 SIbbaldia. Petals yellow, sessile, minute and narrow. Stamens ft: fllaments rerr 



short, filiform. Carpels 6 to 10, on a dry receptacle. Leaves S-fuIloUte : leaflcU 



S-toothed. 



