126 ROSACEAE (ROSE FAMILY) 



follicles or drupelets. Seeds i to few. — Most difficult groups have 

 keys to genera only. (F. & R. pp. 206-221.) 



A. Shrubs. 

 B. Leaves simple; plants not vines. 

 C. Leaves 3-lobed at apex, fascicled, 6-25 mm. long, cuneate-obovate, white- 

 tomentose beneath; plant 6-24 dm. high. E. — (Honor of Otto Kuntze, a 

 botanist.) Kunzia tridentata (antelope brush) 



CC. Not as above in all points. 

 D. Leaves pinnately veined, or i-veined, in some pinnately lobed. 

 E. Petals none; styles very long and plumose in fruit; carpels i-seeded. 



CERCOCARPUS ( p. 131) 

 EE. Petals present; styles not plumose in fruit; carpels 2- to several-seeded 



(except Holodiscus). 

 F. Erect, branching; inflorescence not spicate; leaves not rosulate, not 

 entire. 



G. Leaves ovate, shallowly lobed; stamen disk adherent, entire; ovules 2; 



seed I. HOLODISCUS (p. 129) 



GG. Leaves mostly narrower than ovate, not lobed, but often coarsely 



serrate; stamen disk free at margin, not entire; ovules several; seeds 



several. SPIRAEA (p. 128) 



FF. Depressed-caespitose; inflorescence spicate; leaves rosulate, entire. 



PETROPHYTUM (p. 128) 



DD. Leaves palmafely veined, palmately-lobed or -cleft. 



H. Stems I dm. or less long, caespitose, creeping; plant alpine; leaves 3-parted 



and the segments again 2-4-lobed; flowers in racemes. W. C. — (Honor of 



F. P. Lutke, a Russian explorer.) Lutkea pectinata (partridge foot) 



HH. Stems 5-24 dm. high, not caespitose, erect or ascending or divaricate ; 



plant not alpine; leaves 3-5 -lobed halfway to the midvein or shallower; 



flowers in corymbs. PHYSOCARPUS (p. 128) 



BB. Either the leaves compound, or else the plants vines. 



I. Leaves compound; leaflets entire. 



J. Leaves 2-pinnate; leaflets many; petals white; twigs stellate-tomen- 

 tose. E. — (Gk. chamai — on the ground, batis = a starfish; referring to the 

 low spreading form.) Chamaebatiaria millefolium 



JJ. Leaves i-pinnate; leaflets 5-7; petals yellow; twigs silky-villous. W. C. E. 

 — (Gk. dasys = shaggy, pharos = bearing; from the densely villous akenes.) 



Dasiphora fruticosa (shrub s-finger) 



II. Either leaves simple or leaflets not entire. 



K. Fruit of drupelets usually united to form a pulpy berry; shrubs or herbs, 



some trailing, smooth or prickly. RUBTIS (p. 131) 



KK. Fruit a globular or flask-shaped fleshy receptacle containing a few bony 



akenes; shrubs, none trailing, prickly. ROSA (p. 132) 



AA. Herbs. 



L. Leaves simple, 4-12 mm. long, deeply 3-lobed, the lobes 2-4-cleft; plant 2.5-20 



cm. high; petals none. \V. C. E. — (Alkemelyeh is the Arabic name.) 



Alchemilla arvensis (ladv's mantle) 

 LL. Not as above in all characters; petals present at most. 



