236 American Midland Naturalist Monograph No. 2 



3. MiTCHELLA L. — Partridge-berry 



M. repens L. Woods, local; known from Cook, La Salle, Clark, Jackson, 

 Johnson, and Pope counties. May-July. 



4. DiODiA L. 

 (Dioddla Small) 

 D. teres Walt. Rough Buttonwecd. Fields, roadsides, and open woods, 

 chiefly in centr. and s. 111. July-Aug. 



5. Spermacoce L. 



S. glabra Michx. Smooth Buttonweed. Muddy shores, river banks, and wet 

 ground in woods in the s. and w. counties. July-Aug. 



6. Galium L. — Bedstraw 

 1 . Ovary and fruit uncinate-hispid, or at least puberulent. 

 2. Leaves cuspidate, 1 -veined, 6-8 in each whorl. 



3. Leaves narrowly oblanceolate to linear; stems long, weak, reclining, 

 retrorsely hispidulous; corolla white; plants annual; woods and 



thickets, very common; nat. from Eur. May-June. Goose-grass 



G. aparine L. 



3. Leaves narrowly oval; corolla greenish white; plants perennial; damp 



woods. June-Aug. Sweet-scented Bedstraw G. trijlorum Michx. 



2. Leaves not cuspidate, 4 in each whorl. 



4. Leaves narrowly lanceolate, or linear, glabrous or nearly so, or the 



margins and midveins scabrous; flowers white, numerous in a ter- 

 minal panicle; in sandy or rocky soil along roads or in woods and 

 thickets, or occasionally in bogs; n. III. May-July. Northern Bed- 

 straw G. boreale L. 



4. Leaves oval, more or less pubescent. 



5. Leaves 1 -veined, or obscurely 3-veined at base, oval; flowers greenish 

 purple, pedicelled, paniculate; fruit 3-4 mm. in diameter; woods, 



chiefly in the w. and s. counties. June-Aug G. pilosutn Ait. 



5. Leaves 3-veined, oval-lanceolate; flowers greenish yellow, puberulent, 

 sessile or nearly so, in few-flowered cymes; fruit 2-3 mm. in diam- 

 eter; woods. May-July. Wild-licorice G. circaezcms Michx. 



L Ovary and fruit glabrous or nearly so; leaves 1 -veined; corolla white. 

 6. Leaves cuspidate, 5-7 (usually 6) in each whorl. 



7. Leaves linear, 1-2 mm. wide, the margins sparsely antrorsely short- 

 ciliolate or nearly smooth; stems clustered, nearly smooth, 15-30 cm. 

 tall; dry woods, common. June-July G. coucinnuni T. &. G. 



7. Leaves narrowly elliptical-oblanceolate, 2.5-4 mm. wide, the margins 



retrorsely scabrellous; stems reclining or trailing, retrorsely scabrous 

 on the angles, 0.5-2 m. long; swamps and thickets, n. 111. July-Aug. 



Rough Bedstraw G. asprellum L. 



6. Leaves blunt, linear or linear-spatulate. 



8. Corolla 4-lobed, the lobes acute; leaves mostly in fours; stem erect; 



pedicels smooth; moist ground, common. May-June. [G. tinctorium 

 sensu auth., non L.] G. obtusum Bigel. 



