230 CERATOPHYLL^, 



bright greeu, internodes short : leaves linear-lanceolate, broader and 

 clasping at base, retuse or bifid at apex, destitute of stellate scales : 

 styles about equalling the fruit, deciduous : fr. occasionally short- 

 pediTncled, orbicular, or somewhat longer than broad, the lobes wing- 

 margined. — A northern species, sometimes growing in running water ; 

 Sierra Co., Lemnwn. 



Order XXXII. C E R A T P H Y L L /E . 



S. F. Gray, Natural Arrangement of British Plants, ii. 554 (1821). 



Represented by a single species of the genus 



CERATOr-HYLLUM, Liyinxus (Hornwokt). Aquatic herbs, with rigid 

 verticillate leaves, these usually pinnatifid and the segments toothed. 

 Flowers clustered in the leaf-axils, involucrate, unisexual. Involucre 

 multifid. Calyx and corolla wanting. Stamens 14 — 20. Ovary ovate, 

 1-celled ; style filiform, incurved. Fruit a small nutlet ; the seed 

 pendulous. Albumen ; cotyledons 4, verticillate, 2 larger than the 

 others ; plumule conspicuous, compound. 



1. C. (leinersum, Linn. Sp. PL i. 992 (1753) : C. apiculatum, Cham. 

 Linnsea, iv. 503. t. 5 (1829). Stem 1 — *1 ft. long, nearly glabrous ; inter- 

 nodes short : leaves in whorls of 6 or 8 ; the linear segments acute, 

 aculeate-toothed : achene 2 lines long or more, elliptical, somewhat 

 compressed, short-stipitate, with a short spine or tubercule on each side 

 near the base, not margined : style eqiialling the achene. — At San 

 Francisco, Cliaviisso, and at Clear Lake, Simonds. 



Order XXXIII. S A L I C A R I /€ . 



Adanson, Families des Plantes, ii. 232 (1763) ; Juss. Gen. 380 (1789). 

 Lythrari^, Juss. Diet. Sc. Nat. xxvii. 453 (1823). 



Herbs (as to our few species), with entire leaves, and axillary or spicate 

 mostly 5-merous purplish (rarely apetalous) flowers. Calyx tubular, 

 enclosing the ovary but free from it ; the petals and definite stamens 

 borne on the throat of it. Style 1. Capsule mostly 1-celled by the 

 vanishing of the thin partitions. Seeds numerous, small, on a central 

 placenta, exalbuminous. — Family closely allied to Epilobiaceae, but 

 necessarily separated on account of the superior ovary. 



1. LYTHRUM, Liniuriis. Calyx cylindrical, 10^12-angled or -striate, 

 10— 12-toothed ; the teeth alternately long and erect and shorter and 

 incurved. Petals 5 or 6, inserted on the throat of the calyx-tube alter- 



