560 FLORA. 



Leaflets not coriaceous, scarcely reticulated beneath ; loments 

 numerous. 19. M. Canadensis. 



Loment- joints 1-3. 



Leaflets scabrous. 2-5 cm. long. 20. M. rigida. 



Leaflets not scabrous, 1-2 cm. long. 



Plant nearly glabrous throughout. 21. M. Marylandica. 



Stem pubescent ; leaflets and petioles ciliate. 



22. M. obtusa. 



1. Meibomia nudifldra (L.) Kuntze. Naked-flowered Tick-trefoil. 

 T. F. f. 2170.) Slender, the leaves clustered at the summit of the sterile stems: 

 peduncle leafless or rarely with I or 2 leaves; stipules subulate, deciduous; petioles 

 2.5-10 cm. long; leaflets oval or ovate, glabrous or slightly pubescent, pale be- 

 neath, 2.5-8 cm. long, the terminal one rhomboid, the others inequilateral; panicle 

 narrow, few-flowered; flowers rose-purple, 6-1 1 mm. long; calyx-teeth obtuse, the 

 lowest one largest; loment 2-3 -jointed, the joints longer than wide, straight or con- 

 cave on the back, obliquely semi-rhomboidal, pubescent with uncinate hairs, the 

 sutures glabrous. In dry woods, Ouebec to Minn., Fla. and La. July-Aug. 



2. Meibomia grandifldra (Walt.) Kuntze. Pointed-leaved Tick- trefoil. 

 (I. F. f. 2 1 71.) Erect, glabrous or somewhat pubescent, 3-15 dm. high. Petioles 

 6-12 mm. long; stipules subulate, generally persistent; leaflets ovate acuminate, 

 5-15 cm. long, pubescent with scattered hairs; panicle ample; flowers large, rose- 

 purple; loment 2-3 -jointed; joints longer than wide, concave above, obliquely 

 rounded below, uncinate-pubescent. In dry or rocky woods, Quebec to S. Dak., 

 Fla., Neb. and the Ind. Terr. June -Sept. 



3. Meibomia pauciflora (Nutt. ) Kuntze. Few-flowered Tick-trefoil. 

 (I. F. f. 2172.) Decumbent or ascending, pubescent with scattered hairs, 3-9 dm. 

 long. Stipules subulate, deciduous ; leaves alternate, distant, petioled ; leaflets 

 ovate, pubescent, 2.5-8 cm. long, the terminal one rhomboid ; racemes simple, few- 

 flowered; calyx-lobes acute, ciliate; corolla white (?), about 6 mm. long; loment I- 

 4-jointed, the joints concave or straight on the back, obliquely rounded below, 

 uncinate-pubescent. In woods, Out. ?; W. N. Y. to Fla., Ohio, Ark. and La. 

 July-Aug. 



4. Meibomia arenicola Vail. Sand Tick-trefoil. (I. F. f. 2173.) De- 

 cumbent or prostrate, pubescent or glabrate, slender, 3-6 dm. long. Stipules sub- 

 ulate, persistent; petioles about 12 mm. long; leaflets ovate-orbicular, glabrous or 

 nearly so, coriaceous, reticulate-veined ; racemes elongated, usually pubescent; 

 flowers purple, 4-6 mm. long; pedicels slender; loment small, 2-4-jointed, the 

 joints uncinate-pubescent, less convex above than below. 3-5 mm. long; stipe about 

 equalling the calyx-lobes. In dry woods. Md. to Fla.. west to La. July-Sept. 



5. Meibomia Michauxii Vail. Prostrate Tick trefoil. (I. F. f. 2174.) 

 Prostrate. 6-18 dm. long, softly pubescent or densely villous. Stipules ovate or 

 tri insular-ovate, persistent, acuminate, somewhat cordate, ciliate; leaflets nearly 

 orbicular; panicles loose; flowers purple, 6-11 mm. long; calyx-lobes ciliate; lo- 

 in -iit 2.5 cm. long or more, 3-5-jointed; joints obliquely rhomboid below, slightly 

 convex above, uncinate-pubescent; stipe equalling or longer than the calyx-lobes. 

 Dry woods. Me. and Ont. to Minn.. Fla. and La. July-Sept. 



6. Meibomia ochroletaca (M. A. Curtis) Kuntze. Cream flowered Tick- 

 trefoil. (I. F. f. 2175.) Procumbent or decumbent, hirsute, 3-9 dm. long. Stip- 

 ules persistent, cordate; petioles 1.3-3.5 cm. long; leaflets recticulate-veined and 

 somewhat scabrous beneath, 1.7-5 cm - ,on £- tne terminal one rhomboid, the lateral 

 obliquely ovate, smaller or sometimes wanting; racemes simple; loment 2-3 -jointed, 

 the joints slightly more convex below than above, twisted, oval, pale green, gla- 

 brous except the uncinate pubescent sutures; stipe about as long as the calyx-lobes. 

 In woodlands, N. J. to Ga. and Mo. Aug. -Sept. 



7. Meibomia glabella (Michx. 1 Kuntze. Trailing Tick-trefoil. (I. F. f. 

 217C.) Procumbent, glabrous or nearly so; stem sometimes 2.4 m. long. Leaf- 

 lets obtuse, glabrous or sparingly pubescent above, pale beneath, 2.5-6 cm. long, 

 the terminal one slightly rhomboid; racemes panicled; loment 3-5-jointed, the joints 

 obliquely Bern! -rhomboid, Less convex above than below; stipe about 4 mm. long. 

 In dry sandy woods, E. Mass. to N. Y., Perm, and S. Car. Aug. -Sept. 



8. Meibomia sessilifolia (Torr.) Kuntze. Sessii.i i.fwt.d Tick-trefoil. 



