350 PAPILIONACEAE 
Plant smooth, almost without hairs. 
Leaflets an inch or more in length, not 
velvety . D, laevigatum 
Leaflets 1 to gk: in, long, velvety beneath 
viridiforum 
Leaflets less than an. in. in length 
Sibi se 6 els tet. Ds.) Jenarslanmieur 
Plant more or less hairy. 
Leaflets rough to touch . . D. rigidum 
Leaflets not rough to touch. 
Oblong or oblong <ee snared D. Dillenit 
Round ovate . . « . D. obtusum 
1. D. nudiflorum, (L.) DC. (Fig. 1, pl. 78.) NAKED-FLOWERED 
TICK-TREFOIL, This plant is easily recognized by its long naked, or al- 
most naked flower stalk springing from the root and the leafy stem at 
the summit of which all the leaves are crowded. The flower scape often 
reaches a height of 2 ft. or more. Leaves of 3 broadly egg-shaped leaf- 
lets. Flowers purple, not very numerous; pod 2 to 3 jointed. Common 
in dry woods, July-August. 
2. D. grandiflorum, (Walt.) DC. (Fig. 2, pl. 78.) PorntTep- 
LEAVED TICK-TREFOIL. Plant 1 to 5 ft. high, erect; leaves crowded at top 
from which arises the elongated flower stalk. Leaflets round-ovate with 
long taper points. Flowers large, purple. Pod 2 to 3 jointed. Dry 
woods. June-Sept. 
3. D. pauciflorum, (Nutt.) DC. FEW-FLOWERED ‘TICK-TREFOIL. 
Plant erect or more or less decumbent, 1 to 3 ft. high. Somewhat hairy. 
Leaflets oval or egg-shaped, the end one rhomboid, silky, pale beneath. 
Flowers few on a terminal, or axillary naked flower-stalk. Woods. July- 
August. 
4. D. rotundifolium, DC. (Fig. 4, pl. 78.) Prostrate TIcK-TRE- 
FOIL. Stems prostrate, 2 to 6 ft. long, soft hairy; leaflets orbicular, the 
odd one less rounded. Flowers purple; pods constricted nearly equally 
at both margins, 3 to 5 joints. Dry rocky woods. July-Sept. 
5. D. ochroleucum, M. A. Curtis. CREAM-FLOWERED TICK-TREFOIL. 
Stems with scattered hairs, prostrate; leaflets smooth, egg-shaped, yellow- 
ish-green. Flower stalks much elongated; flowers whitish. Pods 2 to 4 
jointed, twisted. Woods in southern part of our area. Aug.-Sept. 
6. D. glabellum, (Michx.) DC. Tramine Tick-TrEFoIL. Plant pro- 
cumbent, stems sometimes 8 ft. long, smooth or nearly so. Leaflets egg- 
shaped or oval, the terminal one somewhat rhomboid. Flower clusters 
terminai or axillary, flowers purple. Pods 2 to 5 jointed, the joints 
somewhat rough to the touch. Dry woods. Aug.-Sept. 
7. D. sessilifolium, (Torr.) T. and G. (Fig. 6, pl. 78.) SrssILE- 
LEAVED TICK-TREFOIL. Stems silky, 2 to 4 ft. high. Leaflets linear, ob- 
tuse at each end, almost without leaf-stalk. Upper surface rough, lower 
silky. Flowers small in long simple or,compound clusters. Dry soil in 
eastern part of our region. July-Sept. 
8. D. strictum, (Pursh.) DC. Strimr Tick-trerom. Erect, very 
straight, 2 to 3 ft. high, silky. Leaflets narrow linear, 1 to 2 in. long, 
obtuse at base, strongly reticulated, not hairy, smooth, on leaf stalks 
which are } to 3 in. long. Joints of pod 1 to 3 (mostly 1). Flowers 
small on slender scapes. July-Sept. 
