402 
CERATOPHYLLACE.E. (hORNWORT FAMILY.) 
ly winged margins armed with blunt teeth, which finally elongate 
and equal the lateral spines; divisions of the leaves minutely serru* 
late, mostly 2-toothed at the apex. — Common. June, July. — Rarely 
found in fruit. Probably C. demjerscjm, L., is also in the country, or 
all the known forms may belong to one species. 
Order 96. CAELITRICHACEiE. (Water-starwort.) 
Aquatic small annuals, with opposite entire leaves, and 
solitary polygamous flowers in their axils, usually between a 
pair of bracts, no proper floral envelopes, and a Globed 
and 4- celled 4- seeded fruit; —consisting only of the genus 
1. CALLITBICHE, L. Water-starwort. 
Stamen solitary, in the sterile flowers between the bracts; in 
the fertile placed between the pistil and the stem, and rarely also 
one on the outer side : filament thread-like : anther heart-shaped, 
by confluence becoming 1-celled. Fruit indehiscent, nut-like, 4- 
lobed and 4-celled, but the styles only 2, awl-shaped, distinct. 
Seed solitary and suspended, filling each cell, anatropous: em¬ 
bryo slender, in the axis, and nearly the length, of the albumen. 
(Name from kclKos, beautiful , and 0pi£, hair, from the almost ca¬ 
pillary and usually tufted stems.) 
!' Verna, L. Fruit nearly sessile ; the lobes parallel in 
MLirst nnd j .1 . . 1 r 
pairs and bluntly keeled on the back; styles constantly erect; bracts 
incurred _• __ i j 
the base, abrupt at the end. 
the U. S. June - Oct._Fri 
the lobes often abortive. 
— Pools, northward, if really growing »n 
nit 4 times as large as in No. 1, some of 
