PEA FAMILY 349 
and marked with reticulations. Northern parts of our region. June- 
July. 
16. AESCHYNOMENE, L. 
Herbs, resembling Hedysarum, with odd pinnate leaves and clusters of 
yellow flowers. Stamens in two groups of 5 each. Pod on a lengthened 
stalk, jointed. 
A. virginica, (L.) BSP. (Fig. 6, pl. 77.) Sensivive Joint VETCH. 
Erect, 2 to 5 ft. high, rough hairy. Leaves of 25 to 55 leaflets, which 
are somewhat sensitive, closing when touched. Flowers few, reddish- 
yellow with veined petals. Pod linear of 5 to 10 nearly square joints. 
Southern part of our area, Aug.-Sept. 
17, STYLOSANTHES, Swartz. 
Low herbs, branching, with wiry stems and 3-foliate leaves. Stipules 
sheathing and uniting with the leaf-stalk. Flowers smal}, yellow, in 
terminal clusters. Calyx tube slender, bell-shaped, the 4 upper teeth 
somewhat united. Standard (upper petal) orbicular. Stamens in two 
groups, each of 5. Pod short, strongly reticulated. 
S. biflora, (L.) Swartz. (Fig. 3, pl. 83.) PENcIL FLowrR. Grow- 
ing in tufts, stems 3 to 2 ft. long, nearly erect or decumbent. Leaflets 
lance-shaped. Clusters few flowered, yellow. Pine barrens, L. I. June- 
September. 
18. DESMODIUM, DC. (Meibomia, Adams) 
Erect or trailing herbs, with (in our species), 3-foliate leaves, the 
leaflets of which are arranged as a pair and an odd leaflet. Flowers 
purple, usually small, in terminal or axillary clusters. Calyx small, its 
divisions being more or less united as two lips. Upper petals (standard) 
round or pear-shaped, side petals (wings) adherent to the keel by means 
of a small transverse band. Stamens in 1 or 2 groups. Pod (loment) 
flat, stalked, consisting of one to several joints. These joints roughened 
by short hairs which aid in their dissemination. 
Stamens 10 in a single group. Pods constricted on lower side, 
Leaves and flowers on separate stalks . . . . . . . D. nudifiorum 
Leaves and flowers on the same stalk. 
Flower stalk long, with many flowers . . . . D. grandiflorum 
Flower stalk bearing but few flowers . . . . . D. pauciforum 
Stamens 9, united, 1 more or less free. Pods constricted above and below, though 
scarcely on the upper margins in Nos. 5, 6 and 11. 
Stems trailing or reclining. 
Leaflets nearly orbicular . . . . . . . =. «. Dz, rotundifolium 
Leaflets egg-shaped. = 
Plant decidedly hairy, flowers nearly white . D. ochroleucum 
Plant nearly smooth, flowers purple . . . . D. glabellum 
Stems erect, not trailing nor decumbent. 
Leaflets narrow, lance-shaped or linear. 
Leaf stalk wanting or nearly so . . . . Dz. sessilifolium 
Leaf stalk present. 
Flowers in~elongated simple cluster . . D._ strictum 
Flowers in a compound cluster . . . D. paniculatum 
Leaflets egg-shaped, 
Length more than 3 times the breadth. 
Plantenctitemmbainy wails Wiens mlrars mn euteD canadense 
Plant not hairy Ait Ls Sen - D. bracteosum 
Length less than 3 times the breadth. 
Joints of pod decidedly longer than broad, plant de- 
cidedly hairy, leaflets abrupt at each end D,. canescens 
Joints about as long as_ broad. 
