ROSACEAE. 135 



throughout; pedicels slender; calyx broadly campanulate, the blunt lobes as 

 long as the tube; petals white, obovate, longer than the calyx-lobes; carpels 

 2 or 3, pubescent, flattened, somewhat united at the base, as long as the calyx, 

 tardily dehiscent. Mostly in pine woods, common. 



Opulaster opulifolius (L.) Kuntze. Very similar to 0. pauciflorus, usually 

 larger; carpels glabrous, a half longer than the calyx. Along streams in 

 woods. The western form is by some authors considered distinct and has 

 been called 0. capitatus (Pursh) Kuntze. 



190. HOLODISCUS. 



Thornless shrubs; leaves alternate, simply pinnately toothed 

 or lobed, without stipules; flowers numerous, white, in terminal 

 panicles; calyx deeply 5-lobed; petals 5, as long as the calyx 

 lobes, rounded; stamens 20, on a perigynous entire ring-like 

 adherent disk, scarcely exserted; pistils 5, with 2 ovules, becom- 

 ing 1-seeded hairy carpels almost indehiscent. 



Holodiscus discolor (Pursh) Maxim. Ocean Spray. Large shrub, 2-5 m. 

 high; young twigs pubescent; leaves triangular-ovate, mostly obtuse, truncate 

 or cuneate at base, woolly-pubescent beneath, glabrous above, 2-5 cm. long; 

 panicle broadly pyramidal, much branched, 10-20 cm. long; flowers small, 

 white, becoming yellowish; calyx densely short-pubescent, the lobes acute, 

 spreading. In canyons and on warm timbered slopes. 



191. SPIRAEA. 



Shrubs or perennial herbs; leaves alternate, simple, without 

 stipules; flowers white or pink, perfect, in racemes, cymes, 

 corymbs, or panicles; calyx 4- or 5-lobed; petals 4 or 5, exceeding 

 the calyx and inserted on the calyx-tube; stamens numerous, dis- 

 tinct, on a disk which is free at the edge and crenate or glandular- 

 toothed; filaments much exserted; pistils commonly 5, superior, 

 alternate with the calyx-lobes; ovules 5-11; follicles usually 5, 

 not inflated, 1-valved; seeds few-several. 



Flowers panicled. S. menziesii. 



Flowers corymbose. S. corymbosa. 



Spiraea menziesii Hook. Erect shrub, 1-1.5 m. high, not much branched, 

 minutely pubescent on the young twigs and under side of the leaves; leaves 

 oblong, acute or obtuse, rounded or cuneate at base, green on both sides, 

 coarsely serrate above the middle, rarely entire, 3-6 cm. long; petioles 

 short; panicles dense, pyramidal or oblong, 5-20 cm. long; flowers rose- 

 colored; calyx-lobes becoming reflexed; carpels 5, glabrous. In moist places 

 in wooded regions. 



Spiraea menziesii pyramidata (Greene) Piper n. comb. (S. pyramidata 

 Greene.) Flowers white. Often growing with the species and intermediate 

 pink flowered forms occurring also. 



Spiraea corymbosa Raf. Low shrub, 30-60 cm. high, branched below; 

 leaves elliptic or ovate, rounded at base, 2-6 cm. long, coarsely and unevenly 

 serrate or incised above the middle, green and glabrous on both sides; petioles 

 short; inflorescence a flat-topped dense corymb, 5-12 cm. across; flowers small, 

 white; carpels 5, glabrous. Common in open woods or copses. 



