74 Flora of the Palouse Regio?i 



S. rubra Presl. Annual, sometimes biennial or perennial, prostrate or 

 decumbent: stems slender, 10-30 cm. long, smootb below, glandular above: 

 leaves linear, cuspidate, 8-12 mm. long; stipules silvery, attenuate-lanceo- 

 late, 4-5 mm. long: flowers in a small cyme; pedicels filiform, exceeding tbe 

 leaf-like bracts; petals pink, hardly longer than the sepals. Roadsides, not 

 common. 



S. diandra var. bracteata Robinson. Much like the preceding but 

 more glandular: leaves, excepting the reduced upper ones, not cuspidate; 

 stipules small, short, triangular: petals pinkish, shorter than the sepals. 

 Banks of Snake River at Almota, rare. 



Family 30. NYMPHAEACEAE. 



Aquatic perennial herbs, with horizontal rootstocks: leaves pel- 

 tate, floating, submersed or rarely immersed: flowers perfect, sol- 

 itary, axillary, on long peduncles: sepals 3, 4, 6 or more: petals 

 5-many, often grading into thesepals or stamens: stamens 5-many: 

 carpels 3-many, indehiscent, free or immersed in a fleshy recep- 

 tacle or more or less coalescent into a fleshy fruit: endosperm 

 present or none. 



112. NUPHAR. 



Acaulesceut 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, hypogynous: stigmas 

 radiate on the summit of the 10-25-celled ovary. 



N. polysepalum Knglem. Leaves orbicular or broadly oval, deeply cor- 

 date, 20-30 cm. long, 12-20 cm. broad: calyx subglobose, about 8 cm. broad; 

 sepals 8-12, yellow, often red-tinged: petals 12-18, ovate-cuneate, truncate, 

 1-1.5 cm. long: stamens very numerous: fruit subglobose, 4-5 cm. long. 

 Ponds near Moscow. 



Family 31. RANUNCUEACEAE. 



Annual or perennial herbs or some woody plants with acrid sap: 

 leaves alternate (opposite in Clematis), simple or compound; 

 stipules none, but the base of the petioles often clasping or sheath- 

 ing: flowers regular or irregular: sepals 3-15, generally soon with- 

 ering, often petal-like: petals 3-15, or wanting: stamens numer- 

 ous, hypogynous: carpels numerous,, or rarely solitary, separate, 

 f -celled, 1 -many-ovuled; endosperm present. 



