658 Oedeb 126.— CBBATOPHTLLAOBjE. 



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

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



P. ceratoph^llum Mx. Lvs. diohotomously dissected ; fls. 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 the lacerated calyx. Jl. (Lacis ceratophylla Bougard.) 



Okdbr CXXVI. CERATOPHYLLACE^. Hornworts. 



Herts aquatic, with verticillate, dichotomously dissected leaves. Flowers mo. 



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



cleft. i Anthers (12 to 24) sessile. S A simple, 1-oelled ovary. Seed suspended, 



orthotropous, embryo with 2 pairs of cotyledons. 



Genus 1 only, with C ? species^ in the stre.am3 and puols of the northern hemisphere. 

 Properties — Unimportant. 



CERATOPHYL'LUM, L. Hornwort. (Gr. Kigag, a horn, (pvXXov, 

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

 the same as that of the Order. 



C. demersum L. Lvs. 6 to 8 in a whorl, doubly dichotomous, dentate-spines- 

 cent on the back ; fls. axillary ; fr. 3-spined. — y An aquatic weed in ditches, etc., 

 N. T. to Va., "W. to 111. St. floating or prostrate, 8 to 16' long, filiform, with 

 numerous whorls of leave."!. These are dichotomously divided into 2 or more 

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

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



FIG. C92. Tdxus Oanadfeusis— nalied seeds. 



