296 Okdik 46.— LKGUMmOSvE. 



12 P. n^na DC. Low, ascending; Iva. obovate and Bpatulato, mostly radical; 

 heads mate, becoming obloug, dense ; wings lanoe-ovate, cuspidate-acuminate 

 twice longer than tbe sliglitly crested keel. — S. States, in pine woods, common. 

 Sts. 3 to 5' high. Lvs. 1 to 2' long, rosulate. Head often near 1' thick, dispro- 

 portionately large, the fls. citron-yellow, changing to green. Apr., May. 



13 P. ramdsa Ell. Erect, corymbously branched above ; spikes loose, oblong, 

 numerous, forming one or more dense, level-topped cymes; radical lvs. few 

 (small), spatulato, cauUne oblong-linear; seed oval, carunded. — Swamps, Del. to 

 Fla. and La. This and the next arc species of singular aspect. St. If high. Lvp. 

 about 6'' long, few at the root. Spikes about 4" diam., the fls. greenish yellow, 

 becoming finally dark green. Fls. pedicellcd. Jn. — Aug. (P. corymbosa Nutt.) 



14 P. cymosa "Walt. Sts. tall, simple, corymbously branched at top ; lvs. mostly 

 radical, linear, pointed, crowded; stem lvs. very few, linear-subulate; racemes 

 spike-like, numerous, forming a dense, fastigiate cyme ; seed globular, naked. — 

 Swamps, in the phie woods, N. Car. to Fla. Sts. often many from the same root, 

 2 to 4 or 5f high. Lva. grass-like, 3 to 3' long, forming a dense tuft at Iia-^o. 

 Fls. pedicelled, greenish j'cUow, becoming finally green ish-brownr Jn. — Aag. 

 (P. attenuata Ell. gramiuifolia Poir. acutifolia T. &. G.) 



"13 P. vertiolll^ta L. St. ranched ' above, erect ; lvs. linear, verticillato both 

 on the stem and opposite branches ; spikes slender, stalked ; fls. alteniate, crested ; 

 calycino -wings roundish ; seed oljlong, smooth, caruncle hardly half a? long. — • 

 Found on dry hiUs, U. S. and Can. St. very slender, square, 6 to 8' high. Lvs. 

 in whorls of 5 or G, 4 to 10" long, 1" wide. Fls. small, greenish-white, in 

 racemes 3 to 10'' long, which are higher upon tiie branches than upon the main 

 stem. Jl. — Oct. 



fH. AMBIGUA. Branches filiform, alternate ; lower lvs. verticillate, upper alter- 

 nate ; spikes elongated, with the lla. scattered ; seed exactly as in o. — Dry 

 fields and woods, Mass. to Tenn. 



16 P. Boykinii Torr. & Gr. Sts. erect from an ascending base, simple ; lvs. 

 obovate and lanceolate ; whorlcd, a few of the upper linear and alternate ; spike 

 slender, pointed, dense; wings, roundish, concave; caruncle § Me length of the veiij 

 hairy seed. — Ga. and Fla. Sto. slender, several from the same root, 12 to 18' 

 high. Lvs. G to 12" long, in iin, 43, and Os. Fls. whitish, the wings green, with 

 white borders. Jn., Aug. 



17 P. crucidta L. St. erect, somewhat fastigiate, winged at the angles ; lv?> 

 verticillato in 4s, Hnear-oblong, punctate, spikes ovate, dense, obtuse, sessile or 

 nearly so ; seed ovate, smooth, carimch fully as long ; wings delioid-ovaie, cuspidate. 

 — In sphagnous swamps and other low grounds, Mass. to Fla. and La. St. 3 to 12' 

 high, very slender, smooth, slightly winged at the 4 angles. Lvs. 2 to 10'' or 

 :uore long, 1 to 2 " wide (upper ones largest), obtuse, tapering to the base, with 

 small, resinous dots. Spikes capitate, 5" thick, "ft'ings greenish-purple, much 

 dilated at base. Jl., Aug. 



/?. cuSPlD.VT.i. Lvs. linear ; heads larger, oblong, squarrous with the elongated 

 cusps of the wings. This is the more common .southern form. (P. cuspidata 

 Hook,) 



18 P. brevifdlia Nutt. Slender, branched above : lvs. linear, short, remote, in 

 43, or on the branches scattered ; spike oblong, dense, obtuse, on long peduncles ; 

 wings ovate-lanceolate, acute; seed just as in No. 17. — N. Y. to Fla. About If 

 "High. Heads 4" thick, 1 to 2' long (as appears from the squarrous rachis). Lvs. 

 G to 9" long. Fls. roseate. Aug., Sept. 



, P. Baldwinu Nutt. of S. E. Georgia is unknown to the author, unless it bo a 

 variety of P. ramosa, differing in its more dense heads of greenish-white flowers. 



Order XLVI. LEGUMINOS^ Leguminous Plants. • 



Herbs, shrubs, or trees. Leaves alternate, usually compound, margins entira. 

 Stipules 2, at the tumid base of the petiole. Stipels commonly 2, Sepals 5, more 

 or less united, often une<^ual, the odd one always anterior. Petals ,'>, either papilio- 

 naceous or regular, perigyhous, the odd one (when present) postoriDr. Siamem 



