484 CXIX. CALLITRICHACE^. Callitrichs. 



sometimes cordate, nearly as broad as long, with a very short acumination 

 Berries brown and glaucous. 



Order CXVII. SAUKACE^.— Saururads. 



Herts aquatic, with jointed stems. Leaves alternate, with stipules. 



Fls. in spikes, perfect, achlamydeous, each in the axil ofa bract or scale. 



Sta. definite, persistent; antli. 2-celled, connectile thick, continuous with the slender filament. 



Ova. — Carpels 3—5, each few-ovuled. 



Ft. — Capsule or berry 3 — 5-celled, few-seeded. 



Sds. usually solitary ijithe cells. Embryo minute, cordate, outside of hard, farinaceous albumen. 



Genera 4, species 7, natives of China and North America, growing in marshes and pools. Properties 

 unimportant. 



1. SAURtTRUS. 

 Gr. o-aiipa,alizzard, ojjpa, atail; alluding to the form of the inflorescence. 



Inflorescence an anient or spike of 1 -flowered scales ; stamens 6. 7, 

 8 or more ; anthers adnate to the filaments ; ovaries 4 ; berries' 4, 

 1 -seeded. 



S. cERNUu.s. WiLld. (Anonymus aquatica. Walt.) Lizzard Tail. 

 St. angular'; Ivs. cordate, acuminate, petiolate. — %. An aquatic plant, with 

 neat foliage, and yellowish, drooping spikes of flowers. Can. to Car. and 

 W. States! Stem !§ — 2f high, weak, furrowed. Leaves 4 — 6' long, and J as 

 wide, smooth and glaucous, with prominent veins beneath and on petioles 1 — 2- 

 long. Spikes slender, drooping at summit, longer than the leaf. Scales tubu« 

 lar, cleft above, white. Flowers very small and numerous, sessile, consisting 

 only of the long stamens, and the ovaries with their recurved stigmas, Aug. 



Order CXVIII. CERATOPHYLLACE^.— Hornworts. 



Herbs submersed, with dichotnmous, cellular, verticillate leaves. 



Fls. monojcious. Calyx many-parted. 



Sterile.— Sta. indefinite (16—20). Anth. tricuspidate, sessile, 2-ceUed. 



Fertile.— Ova. free, 1-celled, with a suspended, solitary ovule. Style filiform, oblique, sessile. 



fy. — Achenium beaked with the indurated stigma. 



Seed orthrotopous, suspended, exalbuminous, and containing 4 cotyledons. 



Herbs, floating. Leaves cellular, many-cleft, verticillate. 



This order consists of the following genus only, with 6? species. They grow in ditches and pools 

 Europe, Northern Asia, Barbary, and North America. 



CERATOPHYLLUM. 



Gr. Kcpa;, a horn, (pvWov, a leaf; alluding to the horn-Iilie divisions of the leaves. 



Character the same as that of the order. 



C. DEMERSUM. HomwoH. 



Lvs. G — 8 in a Avhorl, doubly dichotomous, dentate-spinescent on the back ; 

 fs. axillary ; //•. 3-spined. — % Ah aquatic weed, in ditches, &c., N. Y. to Va. 

 W. to 111. Stem floating or prostrate, 8 — 16' long, filiform, with numerous 

 whorls of leaves. They are dichotomously divided into 2 or more filiform seg- 

 ments. Flowers minute, axillary, sessile, with sessile anthers. Fruit an 

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



Order CXIX. CALLITRICHACEiE.— Starworts. 



Herbs aquatic, small, with opposite, simple, entire leaves. 



Fls. axillary, solitary, vei^y minute, moncecious, achlamydeous, with 2 colored bracts. 

 Sta. 1, rarely 2; filaments slender; anthers 1-celled, 2-valved, renitbrm. 

 Oj;a. 4-ce!led, 4-lobed; ovules solitary. Stijlesi; stismas simple points. 

 Fr. 1-celled, 4-seeded, indehiscent. Seeds peltate, albuminous. 

 Genus 1, species 6, growing in stagnant waters both of Europe and America. 



CALLITRICHE. 



Gr. KoXof, beautiful, -Spif, rpi'yog, hair; alludmg to the slender stems. 



Character the same as that of the order. — '4- 



C. VERNA. (C. intermedia. Willd. C. aquatica. Bw.) 



Floating; tipper lvs. oblong-spatulate, lower ones linear, obtuse or emar- 



