DEOSKKA. CERATOPHYLLAOE^. 215 



CEHATOPHYLLBM. 



and alternate with them, rarely 2 or 3 times as many, marces- 

 cent; anthers extrorse or innate, the cells distinct or somewhat 

 connivent above, opening down the sides or rarely by a termi- 

 nal pore. Ovary composed of 2-5 united carpels: placenta 

 parietal or filling the base of the cell. Styles 2-5, distinct or 

 united at base, each 2-parted, or multifid and pencil-shaped, 

 sometimes a,ll united into one. Capsule loculicid ally 2-5-valved 

 or indehiscent jnostly many-seeded. Seeds anatropous; the 

 testa sometimes arilliform. Embryo short, at the base of car- 

 tilaginous or fleshy albumen. 



1 DBOSERA. L. Gen. n. 391 (t^uMDEW). 



Small herbs growing in sphagnous or sandy marshes, with the 

 leaves all radical and furnished with numerous long glandular 

 •hairs, and small flowers on simple scapes. Stamens 5, styles 

 3-ft, 2-parted with the divisions somewhat thickened toward the 

 apex, or multifid. Capsule subgiobose or ovoid, usually 3-valved 

 at the top ; the valves plaeentiferous to the top Seeds numer- 

 ous, in 2-5 rows on each placenta. 



D. rotnndifolia L. Pp. i, 281. Leaves spreading, orbicular, ab- 

 ruptly attenuate to a long hairy petiole: scapes 2-6 inches high,5-10-flow- 

 , ered : petals oblong, 2 lines lon^, .i. little exceeding the oblong sepals: styles 

 short, 2-parted: capsule included in the calyx: seeds linear with a loose 

 coat. In cold marshes Alaska to Oalifornia, the Atlantic States and 

 Europe. 



D. An glica Hudson Fl. Angl. 135. Leaves ascending, oblong, attenuate 

 ; into the slender naked petioles : scapes 3-10 inches high, fiometimes forked 

 at the top, few-flowered : petals liiiear-oblanceolate 3-4 lines long nearly 

 twice longer than the obloog sepals : capsule exceeding the calyx : seeds 

 linear with a loose coat. In cold marshes Alaska to Oalifornia, Siberia and 

 northern Europe. 



OEDEfi XXXV. CERATOPHYLLACE^. Gray, Ann. Lye. 

 N. Y. iv. 41. 



Perennial submerged aquatic herbs with cylindrical jointed 

 stems and branches, verticillate, sessile, filliformly 2-3-choto- 

 mous leaves without stipules, and sessile axillary-flowers. 

 Flowers monoecious without perianth but surrounded by a 

 persistent 8 -12-cleft involucre; anthers numerous sessile , fleshy, 

 2-3-cuspidate at top, ovary solitary, 1-celled, with a pendulous 

 orthotropous ovule; achene beaked by the slender persistent 

 style,seeds with membranous transparent testa and no albumen; 

 radicle inferior very short; the cotyledons thick and oval, the 

 highly developed plumule consisting of several nodes and 

 leaves. 



1 CERATOPHYLLUM L. Gajrtn Fr. t. 44. 



Characters as of the order. 

 C. demersum L. Sp. 1409. Stems very slender, a foot or two long. 



