HI rui.V(;ALACKVi:. (milkwout iamii.v.) 



!•' p. incarnata, I-. Stein often sinijdr, j^'lamons ; li'iivcs scuttcrcd, lin- 

 ear, lli^liy, soiiK'liiiu's ininuti- aiul sulmlato ; spiki-s lanc-i'olatc, acute, donsc- 

 floweivd ; petals uiiiteil into a tube wliieli is twice as long as tlie elliptical 

 wings, conspieiioiisly crested ; caniiule spongy, a-s long a.s llie stalk of the 

 oval hairy seed. — Dry sandy soil, Florida to Mississi|)pi, and northward. Jinie 

 - Angnst. — .StL'in l°-2° high. Bracts deciduous. Flowers and often tlie racliis 

 purple. 



11 P. setaeea, Midix. Stems simple or sparingly branclied, .slender; 

 leaves minute, scale-like; spikes oblong, dcnse-tiowered, acute ; wings oblong, 

 acute, as long as the ])etals ; caruncle and seeds as in No. 10. — Low pine bar- 

 rens, Florida to North Carolina, and westward. May -July. — Stem 1° high. 

 Spikes ^'- 1' long. Flowers pale rose-color or whitish. Bracts deciduous. 



♦ * * Spikes solitary : leaves whoiled: flowers purple. 



12. P. cruciata, L. Stem erect, 4-angled, simple or branched; leaves 

 in fours, linear or oblong-linear, thick, obtuse, the upper ones alternate; spikes 

 large, ovate, becoming cylindrical, short-peduncled ; wings ovate, tapering into 

 along subulate point ; lobes of the caruncle linear, collateral, as long as the 

 smoothish oval seed. — Pinc-liarrcn swani]>s, Florida to Mississijipi, and north- 

 ward. July - Oct. — Stem G' - 12' high. Spikes 1' - 2' long, %' thick. Flowers 

 pale rose-color. Bracts persistent. 



13. P. brevifolia, Nutt. Stem weak, 4-anglcd, with long and spreading 

 branches ; leaves thin, lanceolate or linear, acute, the lower ones in fours ; spikes 

 small, ovate, long-pedundcd ; wings lanceolate-ovate, barely pointed ; caruncle 

 as long as the obovate hairy seed. — Bogs, Florida and northward. July- 

 Oct. — Stem 1°- Ii° long. Spikes scarcely half as large as in the preceding. 

 Flowers reddish-purple. Bracts persistent. 



14. P. Hookeri, Ton-. & Gray. Stems short, weak, much branched, 4- 

 anglcd ; leaves in fours, short, linear, acutish ; spikes long-pedunclcd, ovatc- 

 lanceolatc, acuminate, loose-flowered ; wings erect, lanceolate-ovate, acute ; 

 caruncle as long as the ovoid sparse-hairy and viscid seed. — Low grassy 

 ]jinc barrens, West Florida and westward. July -Sept. — Stems 6'- 10' high. 

 Leaves 4" - C" long ; those of the branches mostly alternate. Flowers pale 

 rose-color. Bracts persistent. 



§ 2. Flowers in slender racemes or spikes. 

 * Leaves alternate : perennials or biennials. 



l.'j. P. grandiflora, Walt. Pubescent; stems branching ; leaves lanceo- 

 late ; flowers large, crestless, scattered in long racemes ; fiuiting pedicels droop- 

 ing ; wings large, orI)icular, erect ; caruncle enclosing the stalk of the oblong 

 hairy seed. (1*. pubescens, Miilil.) — Varies with smoothish linear leaves, and 

 smaller flowers. (P. flabellata, Skuttl.) — Dry light soil, Florida to South Car- 

 olina, and westward. July -Sept. U — Stem 1° high. Racemes 3'- 6' long, 

 often lateral by the prolongation of the stem. Flowers bright purple, turning 

 greenish. 



IC. P. polygama, Walt. Smooth; stems numcrou-, simple; leaves 

 oblong-linear, tiie lowest spatulatc or obovate ; flowers of two kinds, viz. one 



