658 



Ordbe 126.— CERATOPHYLLACE^E. 



oblong-ovoid ; stigmas 2, sessile recurved ; capsule 2-celled ; seeds 

 minute. — Small, submersed herbs, adhering to stones and pebbles. 



P. ceratoph^llum Mx. Lvs. dichotomously dissected ; flg. solitary, axillary. — 

 Mid. W. and S. States, in shallow streams. St. a few inches long, usually desti- 

 tute of roots and attached to stones by lateral, fleshy processes. Lvs. numerous, 

 olive-green, alternate, coriaceous, divided into many long, linear-setaceous seg- 

 ments. Fls. on short, thick peduncles, the 2 stamens and styles at length burst- 

 ing through tho lacerated calyx. Jl. (Lacis ceratophylla Bougard.) 



Order CXXVI. CERATOPHYLLACE^E. Hornworts. 



Herbs aquatic, with verticillato, dichotomously dissected leaves. Flowers mo- 

 noecious, sessile, axillary, minute, with neither corolla nor calyx. Involucre 8 to 12- 

 cleft. $ Anthers (12 to 24) sessile. $ A simple, 1-cellod ovary. Seed suspended, 

 orthotropous, embryo with 2 pairs of cotyledons. 



Genua 1 only, with 6? species, in the streams anil pools of the northern hemisphere. 

 Properties — Unimportant. 



CERATOPHYL'LUM, L. Hornwort. (Gr. Kt'pac, a horn, QvXXov, 

 a leaf; alluding to the horn-like divisions of the leaves.) Character 

 the same as that of the Order. 



C. demersvim L. Lvs. 6 to 8 in a whorl, doubly diehotomous, dentate-spines- 

 cent on the back ; fls. axillary ; fr. 3-spined.— 2/. An aquatic weed in ditches, eta, 

 N. Y. to Va., "W. to 111. St. floating or prostrate, 8 to 16' long, filiform, with 

 numerous whorls of leaves. These are dichotomously divided into 2 or more 

 narrow, stiff segments. Fls. minute, axillary, sessile, with sessile anthers. IJfc 

 an oblong, beaked capsule, with 1 seed. Jl. — Sept 



FIG. C92. Taxus Canad6nsU— naked eecda. 



