150 CARYOPHYLLACEAE. 



pointed, usually curved, glabrous, 15-25 mm. long; inflorescence loose, gland- 

 ular-puberulent; sepals ovate, obtuse, 3-nerved, scarious margined; petals 

 obovatc, longer than the sepals; capsule longer than the calyx. 

 Common in the mountains at about 2000 m. altitude. 



Arenaria tenella Nutt. Stems slender, loosely branched, 10-20 cm. high; 

 leaves subulate, acute, 6-10 mm. long, the broadened bases connate, the upper 

 reduced; inflorescence glandular-puberulent; pedicels very slender, much 

 longer than the calyx; sepals lanceoUite, acuminate, strongly 3-nervcd; petals 

 oblong, as long as the sepals; capsule ovoid; seeds roughened. 



In dry gravelly prairies. 



Arenaria nuttallii Pax. Perennial, very leafy, densely branched from a 

 stout vertical root, glandular throughout; leaves linear-subulate, rigid, sharp- 

 pointed, spreading, 6-8 mm. long, connate at base, the uppermost little reduced ; 

 flowers numerous, in open cymes; sepals lanceolate, acuminate, faintly 3-nerved; 

 petals acutish, not equalling the sepals; capsule ovoid, shorter than the calyx. 



On the high peaks of the Cascade Mountains at about 2500 m. altitude. 



Arenaria verna L. Perennial, closely tufted, glandular-pubescent, 5-15 cm. 

 high; leaves linear-subulate, flat, strongly 3-nervcd; sepals ovate-lanceolate, 

 acuminate, the margins scarious; petals narrowly obovate, obtuse, as long as 

 the sepals; capsule longer than the calyx. 



In rocky places, Cascade and Olympic Mountains, at about 2500 m. altitude. 



186. MOEHRINGIA. 



Low perennial herbs, with lanceolate elliptic or oblong sessile 

 or short-petioled soft leaves; flowers white, solitary in the axils 

 of the leaves or in terminal cymes; sepals and petals 4 or 5; 

 stamens 8 or 10; capsule oblong, few-seeded; seeds each with a 

 membranous broad strophiole. 



Petals longer than the obtusish sepals. M. lateriflora. 



Petals shorter than the acuminate sepals. M. macrophylla. 



Moehringia lateriflora (L.) Fenzl. Mostly puberulent throughout; stems 

 slender, terete, erect or decumbent, simple or few-branched, 10-30 cm. high; 

 leaves elliptic or oblong, sessile, obtuse, 1-2 cm. long; cymes few-flowered; 

 sepals obtuse or acutish, 2 mm. long, one half the length of the obovate petals. 



In open woods, infrequent. 



Moehringia macrophylla (Hook.) Torr. Minutely puberulent; stems erect 

 or decumbent, angled, 5-10 cm. tall, mostly simple; leaves lanceolate, acute 

 at each end, 2-6 cm. long; cymes few-flowered; sepals ovate-lanceolate, acu- 

 minate, 3 mm. long, exceeding the petals. 



In open woods, not rare. 



Family 40. NYMPHAEACEAE. Waterlily Family. 

 Aquatic perennial herbs with horizontal rootstocks; leaves 

 peltate or cordate, floating, submersed or rarely immersed ; flowers 

 perfect, solitary, axillary, on long peduncles; sepals 3, 4, 6 or 

 more; petals 5-many, often grading into the sepals or stamens; 

 stamens 5-many; carpels 3-many, indehiscent, free or immersed 

 in a fleshy receptacle or more or less coalescent into a fleshy fruit; 

 endosperm present or none. 



