59 6 FLORA. 



bearing 4 crescent- shaped glands; capsule nodding, smooth; seeds oblong, terete, 

 smooth. In waste places, Mass. to N. Y. and Mich. Nat. from Europe. Summer. 



34. Euphorbia lucida L. Shining Spurge. (I. F. f. 2336.) Deep green. 

 Stems stout, usually clustered, 2-5 dm. high, usually very leafy, topped by a 

 4-7-rayed umbel; branches simple or forked; leaves alternate, linear or linear- 

 oblong. 1. 2-10 cm. long, 4-12 mm. broad, entire, mostly apiculate, those subtend- 

 ing the umbel ovate, oval or obovate; bracts reniform; involucres campanulate, 

 3 mm. long, bearing 4 yellowish oblong crescent-shaped, 2-horned glands; capsu' : 

 globose-ovoid, 4 mm. in diameter, nodding, smooth, finely wrinkled; seeds oblong, 

 2.5 3 mm. long, nearly terete, whitish, smooth. In fields along the Susquehanna 

 River, southern N. Y. and northern Penn. Nat. from Europe. \E. Nicaeensis 

 111. FL] July-Sept. 



35. Euphorbia Cyparissias L. Cypress Spurge. (I. F. f. 2337. ) Bright 

 green. Stems clustered in large patches, 3 dm. high, or less, the branches topped 

 by many-rayed umbels; leaves linear, or almost filiform, 1.2-2.5 cm - l on g< 

 0.5-3 mm. broad; involucres turbinate-campanulate, 2 mm. long, with 4 unap- 

 pendaged crescent-shaped glands; capsule subglobose, 3 mm. in diameter, granu- 

 lar on the rounded lobes; seeds oblong, 2 mm. long, smooth. Escaped from gar- 

 dens to waste places, N. E. to Kans. Nat. from Europe. May-Sept. 



36. Euphorbia robusta (Engelm.) Small. Rocky Mountain Spurge. (I. F. 

 f. 2338.) Glaucous. Stems clustered, 1-3.5 dm. tall, topped by a 3-5 -rayed 

 umbel; leaves scattered, ovate or oblong-ovate. 1-1.8 mm. long, obtuse or apicu- 

 late, entire, sessile; bracts opposite, triangular-ovate or subreniform; involucres 

 campanulate, 3 mm. long, bearing 4 somewhat crescent-shaped unappendaged buff 

 crenulate glands; capsule globose-ovoid. 4-4.5 mm. long, its lobes rounded; seeds 

 oblong or obovoid -oblong, terete, 2.3-2.5 mm. long, gray, minutely pitted. S. Dak., 

 Mont, and Wyo. to Neb. and Ark. May-Oct. 



Family 9. CALLITRICHACEAE Lindl.* 



Water-starwort Family. 



Herbaceous aquatic or rarely terrestrial plants, with slender or capil- 

 lary stems, opposite exstipulate entire spatulate or linear leaves, and 

 minute perfect or monoecious axillary flowers. Perianth none. Bracts 

 2, sac-like, or none. Stamen 1; filament elongated, filiform ; anthers cor- 

 date, 2-celled, opening by lateral slits. Pistil 1 ; ovary 4-celled ; ovules 1 

 in each cavity ; styles 2, filiform, papillose nearly the whole length. 

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

 margins, separating at maturity into 4 flattish i-seeded carpels. Seed 

 anatropous, pendulous ; endosperm fleshy ; embryo straight or nearly so, 

 almost as long as the endosperm. Consists of the following genus : 



1. CALLITRICHE L. 



Characters of the family. [Greek, beautiful hair, from the hair like stems.] 



Alxmt 20 species of wide distribution. Besides the following, about 7 others occur 

 in southern and western N. Am. 



Fruit short-peduncled; bracts wanting ; terrestrial. 1. C. Atistini. 

 Fruit sessile; aquatic, or some forms growing in mud. 

 Bracts present. 



Fruit oval, flat on the face, longer than the styles. 2. C. palustris. 



Fruit obovate, plano-convex, shorter than the styles. 3. C. keterophylla. 



Bracts none; leaves all linear, submersed. 4. C. bifida. 



1. Callitriche Aristini Engelm. Terrestrial Watf.k-starwort. (I. E. f. 

 2339.) Tufted, tin- bran iding on the ground or ascending, 1-5 cm. I< 



Leaves spatulate Or obovate, 3 nerved. 3-4 nun. long, about 2 nun. wide, cbtusc, 

 tapering into a short margined petiole, destitute of stellate scales; fruit ab< ut 

 0.5 mm. long ami nearly 1 nun. broad, deeply notched at both ends, its lobes with 



♦Contributed by tin- late Rev. Thomas MORONG. 



