ROSACES. 113 



2. HOLODISCUS, Maxim. Unarmed deciduous shrubs with simple 

 toothed or lobed extipulate leaves and terminal panicles of numerous 

 small white flowers. Calyx deeply 5-cleft, nearly rotate. Petals 5, 

 rounded, imbricate in bud. Stamens 20, inserted on an annular peri- 

 gynous disk. Pistils 5, wholly distinct, becoming 1-seeded hairy carpels, 

 alternate with the calyx-lobes, very tardily dehiscent by the dorsal 

 suture only, or indehiscent. 



1. H. discolor (Pursh), Maxim. Shrub 26 ft. high, the branches 

 short, rigid, clothed with a gray more or less broken and shreddy bark: 

 leaves ovate, cuneately narrowed to a short winged petiole, above the 

 middle pinnately toothed or lobed, the lobes when present entire, deep 

 green and nearly glabrous above, whitish-tomentose beneath; panicles 

 erect on short erect or ascending branches; carpels more or less densely 

 hirsute throughout. On dry rocky slopes and summits. July. 



2. H. ariaefolius (Smith). Shrub commonly 818 ft. high, with 

 long spreading or recurved slender branches, these and the stem clothed 

 with a smooth unbroken dark brown bark: leaves short-petioled, deltoid- 

 ovate, 2 -3 in. long, two-thirds as broad, almost truncate at base, pinnately 

 shallow-lobed from base to apex, the lobes entire or toothed, green and 

 glabrate above, slightly paler beneath with sparse villous appressed 

 pubescence: panicle ample, 6 10 in. long, drooping in fl., erect in fr.: 

 carpels compressed, hirsute along both sutures, the sides glabrous and 

 covered with sessile globular resin-dots. Woods of the Coast Eange, at 

 low elevations among the hills. 



3. CERCOCARPUS, HBK. (MOUNTAIN MAHOGANY). Unarmed 

 evergreen shrubs or trees with simple leaves, small stipules, and axillary 

 solitary or fascicled apetalous flowers. Calyx salverform, the 5-lobed 

 limb deciduous. Stamens x , in 2 or 3 rows on the limb of the calyx. 

 Pistil 1; style terminal; stigma terminal; ovule solitary, ascending. 

 Fruit a terete villous achene surmounted by a long villous twisted style. 

 Seed linear; albumen 0. 



1. C. betulaefolius, Nutt. Shrubby or arborescent, 6 15 ft. high, 

 the stem with a gray thin flaky bark; branches spreading or recurved: 

 leaves somewhat coriaceous, broadly obovate with more or less cuneate 

 entire base, but coarsely serrate -toothed above the middle, conspicuously 

 feather-veined, glabrous above, pubescent beneath, ^ %/4 in. long: 

 calyx-tube at length % in. long: tail of achene often 3 in. long. Hills of 

 the Coast Kange. 



4. ADEXOSTOMA, Hooker & Arnott (CHAMISO). Unarmed evergreen 

 shrubs with rigid linear entire sessile fascicled stipulate leaves, and 

 small white flowers in closely panicled terminal racemes. Calyx obcon- 

 ical, 5- toothed, 10-striate, the orifice bearing 5 oblong glands. Petals 5, 

 orbicular. Stamens 10 15, inserted in bundles alternate with the petals. 



