57 2 FLORA. 



Stipules ovate-lanceolate, 2-4 mm. long; leaflets ovate, lanceolate or oblong, spar- 

 ingly pubescent, entire, or rarely with 1 or 2 shallow lobes; peduncles generally 

 much longer than the leaves; flowers several, pink, lading yellowish, similar to 

 those of the preceding; pod straight, little compressed, sparingly pubescent; seeds 

 mealy-pubescent In sandy soil, L. I. to Fla., Ind. and La. July-Sept 



3 Strophostyles pauciflora < Benin.) S. Wats. Small Wild Bean. (I. F. f. 

 2237.) Steins finely retrorsely hirsute, low climbing or trailing, 3-7 dm. long. 

 Stipules ovate-lanceolate, I -3 mm. long; leaflets lanceolate or linear-oblong, ob- 

 tuse, entire; peduncles exceeding the leaves; flowers 2-6, purplish; pod flat, about 

 2.5 cm. long and 4 mm. wide, pubescent; seeds purple, glabrous and shining at 

 lKiturity. Along rivers, Ind. to S. Dak., Miss., Kans. and Tex. July-Sept. 



46. VIGNA Savi. 



Herbaceous vines, or sometimes erect herbs, with pinnately 3-foliolate stipulate 

 leaves, the leaflets broad. Flowers clustered at the ends of long axillary peduncles, 

 yellowish or purplish, the rachis of the head or raceme knotty, the bracts and 

 bractlets early deciduous. Calyx 5 -toothed, or the 2 upper teeth united. Standard 

 nearly orbicular, auricled at the base; wings shorter than the standard; keel about 

 equalling the standard, slightly incurved. Stamens diadelphous (9 and I). Ovary 

 sessile; ovules numerous; style bearded along the inner side. Pod linear, nearly 

 terete, 2-valved, [In honor of Domenic Vigni, a commentator on Theophra:-tus. J 

 About 30 species, natives of warm and tropical regions. Besides the following an- 

 other occurs in the southern U. S. 



1. Vigna Sinensis (L.) Endl. Cow Pea. China Bean. Black-eyed 

 Bean. <I. F. f. 2238.) Annual; stem striate. Stipules ovate or ovate lanceolate, 

 acuminate, prolonged backward, 6-20 mm. long; terminal leaflet rhombic-ovate, 

 5-15 cm. long, often about as wide, long-stalked; lateral leaflets very obliquely 

 ovate and inequilateral, short-stalked; flowers few, yellowish, 1.6-2 cm. long; pod 

 fleshy, 1-2 dm. long, 6-8 mm. thick, nearly straight. Escaped from cultivation. 

 Mo. to Tex. and Ga. Native of Asia. July -Sept. 



Order 19. GERANIALES. 



Dicotyledonous herbs, shrubs or trees, usually with petals, and these 

 separate (more or less united in Polygalaceae, wanting in most Euphorb- 

 iaceae, in Callitrichaceae, and in some species of Xci7ithoxylum in Ruta- 

 ceae) ; sepals mostly distinct ; stamens few, rarely more than twice as 

 many as the sepals, opposite them when as many ; ovary superior, com- 

 pound ; ovules pendulous, the raphe toward the axis of the ovary. 



Stamens more than one; land plants. 



Flowers regular or nearly so ; petals present, usually as many as the sepals. 

 Herbs, the leaves not punctate; flowers perfect. 

 Leaves not pinnately compound. 



Capsule at length splitting into its 5 carpels; leaves lobed or dissected. 



Fam. 1. Geraniaceae. 

 Capsule 2-5-celled, not splitting into its carpels. 



Stamens 2-3 times as many as the petals; leaves 3-foliolate in our 



species. * Fam. 2. Oxalidaceae. 



Stamens as many as the petals ; leaves entire. Fam. 3. I.iuacejf. 



Leaves pinnately compound. Fam. 4. Zygophyllaceae. 



Our species trees or shrubs with compound leaves, often punctate ; flowers 



dioecious or polygamous. 



punctate. Fam. 5. Rutactae. 



Leaves not punctate, the bitter bark with oil-sacs. Fam. 6. Simarubaccae. 



Flowers very irregular ; petals .}; stamens usually 8; herbs. Fam. 7. Polygalaceae. 



Flowers regular, often apetalous, small, monoecious; carpels mostly 3; herbs or 



low shrulN, mostly with milky juice. Fam. 8. F.uphorbuiccae. 



Stamen only 1 ; perianth none; styles 2; small aquatic or rarely terrestrial plants with 



opposite entire leaves. Fam. 9. Callitrichaceae 



