216 CALLITRICHACEAE. 



Annuals. 



Glands disk-like; capsules warty. 1. T. dictyospermus. 



Glands crescent-shaped, 2-horned; capsule 



smooth. 2. T. peplus. 



Perennial. 3. T. palmeri. 



1. T. dictyospermus (F. & M.) Heller. Glabrous, annual; stem 

 simple or sometimes branching below, dichotomously branched 

 above, 15-45 cm. high; stem leaves scattered, oblong-spatulate to 

 obovate-spatulate, obtuse, obtusely serrate, often retuse, 1-3 cm. 

 long; on the branches opposite, broadly ovate to oblong, the floral 

 ones roundish-ovate, subcordate, mucronate, 4-12 mm. long; rays 

 usually 3 times forked; involucres and glands small; styles bifid or 

 parted; capsule with rounded and warty lobes, 2-3 mm. long; seeds 

 subglobose, delicately netted-veined, dark colored. 



Occasional in rather moist places in all our foothills and moun- 

 tains, confined mostly to the chaparral belt. 



2. T. peplus (L.) Gaertn. Annual; stems simple or branched 

 below, erect, dichotomously branched above, 1-2 dm. high; stem 

 leaves scattered; involucres bearing 4 crescent-shaped glands with 

 long slender horns, and a pair of wing-like crests on each lobe. 



An introduced species, growing in gardens, and greenhouses. 



3. T. palmeri (Engelm.) Abrams, n. comb. A stout glabrous 

 perennial, 2-4 dm. high; stems simple below, or with a few erect 

 branches, umbelliferous above; leaves ovate, obtuse, 12-18 mm. 

 long; the floral ones nearly reniform; involucres 2 mm. long, with 

 rounded entire ciliate lobes; glands shortly stipitate, crenate and 

 slightly horned; capsule ovate, 2 mm. long; seeds rugose. {Euphor- 

 bia palmeri Engelm.) 



A common species in the coniferous forest of the San Bernardino 

 and Cuyamaca Mountains; Swartout Canyon, San Gabriel Moun- 

 tains. 



Family 55. CALLITRICHACEAE. 



Water Starwort Family. 



Herbaceous aquatic or rarely terrestrial plants, with 

 slender or capillary stems, opposite exstlpulate entire 

 leaves, and minute perfect monoecious axillary flowers. 

 Perianth none. Bracts 2, sac-like or none. Stamens 1; 

 jfilaments elongated, filiform; anthers cordate, 2-celled, 

 opening by lateral slits. Pistil 1; ovary 4-celled; ovules 

 1 In each cell; styles 2, filiform. Fruit compressed, 

 lobed, the lobes more or less winged or keeled on the 

 margins, separating at maturity into 4 flattish 1 -seeded 

 carpels. Seed anatropous, pendulous; endosperm fleshy; 

 embryo straight or slightly curved. 



