166 ROSACEA. 



the triangular lobes shorter than the tube, reflexed, pubescent within; 

 petals broadly obovate, rounded at the apex, 4-6 lines long, white; stam- 

 ens about equalling the calyx-lobes, persistent ; styles filiform, thickened 

 toward the summit, longer than the stamens, united and pubescent be- 

 low; fruit globose, 4-5 lines in diameter, crowned with the persistent 

 calyx-lobes. On dry hillsides, eastern Oregon to California. 



Order XXIX. ROSACEA Juss. Hort. Trian., Endl. Gen. 1240. 



Herbs or shrubs with alternate simple or compound leaves, 

 mostly foliaceous commonly adnate stipules and perfect or uni- 

 sexual flowers in cymes, corymbs, panicles or solitary. Calyx 

 free from the ovary, 4-5-clef t, the segments mostly valvaf.e in 

 the bud, commonly persistent. Petals perigynous, as many as 

 the lobes of the cialyx and alternate with them, or none. Sta- 

 mens five to many, perigynous, rarely hypogynous. Pistils one 

 to many; ovary usually one-celled and one-valved, sometimes 

 many-ovuled; ovules pendulous or ascending. Styles as many 

 as the ovaries, inserted terminally or laterally, persistent or 

 deciduous. Fruit achenes drupelets or follicular. Seeds 

 mostly anatropous, with little or no albumen. 



Tribe i. Rose^o. Carpels many, becoming bony achenes, en- 

 closed and concealed in the globose or urn-shaped fleshy calyx- 

 tube which resembles a pome. 



1. Rosa. Erect, usually prickly shrubs with pinnate leaves and large 

 flowers. 



Tribe ii. Sangiiisorbe^. Carpels 1-3, becoming achenes, 

 completely enclosed in the dry and firm calyx-tube, the throat 

 of which is constricted ur sometimes nearly closed :• ovule sus- 

 pended, solitary. Ours are herbs with compound or lobed leaves. 



3. Sangnisorba. Calyx-lobes petaloid, deciduous ; the tube 4r-angled, 

 naked; petals wanting : carpels 1-2 : herbs with compound leaves and 

 red or white flowers in dense spikes. 



3. Agrimflinia. Calyx turbinate, surrounded by a margin of hooked 

 prickles: stamens 5-15: carpels 2: perennial herbs with pinnate 

 leaves and yellow flowers in spicate racemes. 



4. AlchemiUa. Calyx urceolate, naked, minutely bracteolate: petals 

 wanting: stamens 1-4: small annuals with minute flowers in axillary 

 clusters. 



Tribe hi. Dryade^. Carpels numerous, several or solitary, 

 1-ovuled, becoming dry achenes: calyx not enclosing or at 

 least not constricted over the fruit : seeds erect or ascending. 



* Shrubs : carpel solitary : style not elongated in fruit ; stigma 

 decnrrent : calyx imbricated, without bractlets : radicle inferior. 



6. Kunzia. Diffusely branched shrubs with mostly fascicled leaves and 

 solitary yellow flowers, terminal on the short branchlets. 



* * Trees or shrubs ; carpels solitary : style elongated and plumose 

 in fruit: calyx imbricated, without bractlets: seeds erect. 



6. Cercocarpus. Small trees or shrubs with simple leaves and axillary 



