204 ROSACEAE. 



Annuals; diminutive plants, with palmately divided leaves; petals none; pistil (in ours) 



1, becoming an achene 11. Alchemilla. 



3. Trees or shrubs with simple leaves and early-falling stipules; fruit a drupe. — Drupeae 



(Cherry Tribe.) 



Flowers dioecious; pistils 5; drupes 1 to 4 12. Osmaronia. 



Flowers perfect; pistil 1; drupe solitary 13. Prunus. 



B. Ovary inferior. 

 Trees and shrubs with simple leaves and free stipules; fruit a pome, consisting of a 2 to 5- 

 celled ovary which is enclosed in and mostly adherent to the fleshy calyx-tube.— 

 Pomeae (Apple Tribe). 

 Leaves evergreen, coriaceous; flowers small, numerous in a corymbose panicle; fruit 



bright red, the 2 carpels enclosed in the berry-like calyx 14. Hetekomex.ES. 



Leaves deciduous. 



Flowers in corymbs; ovary 2 to 5-celled. 

 Pome drupe-like, containing 2 to 5 bony stones, either separable or united into one; 



branches bearing thorns 15. Crataegus. 



Pome containing 2 to 5 papery or cartilaginous carpels, each 2-seeded. . . 16. Pykls. 



Flowers in racemes, showy; ovary 5-celled, each cell in fruit becoming 2-celled by a 



partition from the back 17. Amelanchikk. 



1. PHYSOCARPUS Maxim. Nine Bark. 

 Diffuse shrubs with reddish brown shreddy bark. Leaves simple; stipules 

 deciduous. Flowers white, in corymbs terminating lateral leafy branchlets. 

 Calyx campanulate, 5-cleft, persistent. Petals 5, rounded, equal. Stamens 

 20 to 24. Pistils 1 to 5, mostly 3, somewhat united toward the base, becoming 

 as many inflated 2 to 4-seeded follicles dehiscent along both sutures. Seeds 

 crustaceous, shining, with copious endosperm. — (Greek phusa, bellows or blad- 

 der, and karpos, fruit.) 



1. P. capitatus (Pursh) Ktze. Erect or straggly shrub 3 to 5 ft. high; 

 leaves roundish or ovate, 3-lobed and irregularly serrate, glabrous or scabrous 

 above, stellate-pubescent beneath, 1 to 2 in. long, on petioles y L > in. long or 

 more; leaves of sterile shoots similar but larger; pedicels and calyx pubescent; 

 corymbs hemispherical, % to 1 in. high; petals l 1 /* lines long; stamens alter- 

 nately long and short ; pods divergent, commonly 3 to 4 lines long, splitting 

 into 2 valves. — (Neillia opulifolia var. mollis of Bot. Cal. Opulaster opuli- 

 folius var. capitatus Jepson.) 



Common along streams or often gregarious on steep north slopes: Coast 

 Eanges (not reported from inner range); Sierra Nevada. 



2. HOLODISCUS Maxim. 



Deciduous shrubs with toothed or lobed leaves and no stipules. Flowers 

 creamy-white, small, numerous in terminal panicles. Calyx persistent, 5-cleft. 

 Petals 5, rounded. Stamens 20, on a ring-like perigynous disk. Pistils 5, 

 distinct, alternate with the calyx-lobes. Follicles hairy, 1-seeded. tardily 

 dehiscent or indehiscent. (Greek holo, whole or complete, and diskos, a 

 disk.) 



1. H. discolor (Pursh) Maxim, var ariaefolius (Wats.) Jepson. Cali- 

 fornia MEADOW SWEET. Spreading shrub 3 to 6 ft. high; leaves ovate to ovate- 

 elliptic in outline, green above, whitish beneath with soft hairs, coarsely serrate 

 or incised above the entire truncate or broadly cuneate base. :: i to 3 in. long, on 

 petioles 2 to lines long; panicle ample, 3 to 8 in. long, often half drooping in 

 anthesis; flowers L% lines long; follicles about 1 line long. 



Canons and low hills of the Coasl Ranges from the coast to the inner ranges. 

 Var. dumosus A.brams. Lower and more compact j panicle less diffuse. — 

 Sierra Nevada, 



