NYMPHAEACEAE. 101 



Arenaria glabrescens (Wats.) Piper. Very similar to A. congesla of which 

 it may be a subspecies; inflorescence loosely cymose; herbage often glandular- 

 puberulent. On high rocky ridges in the Blue Mountains. 



136. 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 

 Hillsides, not rare. 



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. Common in dry pine woods. 



Family 37. 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. 



Leaves cordate; flowers large, yellow. 137. Nymphaea, 101. 



Leaves peltate; flowers small, purple. 138. Brasenia, 102. 



137. NYMPHAEA. Waterlily. 



Acaulescent perennials from stout rootstocks, commonly 

 slightly milky; leaves with united stipules which are sometimes 

 adnate to the base of the petioles; calyx more showy than the 

 corolla; sepals 5-12, concave, roundish, mostly yellow, and petal- 

 like; petals 10-20, hypogynous, small and thick, the innermost 

 or sometimes all of them stamen-like; stamens numerous, hy- 

 pogynous; stigmas radiate on the summit of the 10-25-celled 

 ovary; ovules and seeds numerous. 



