50 ORDER 17. 



14 H. cistf folium Lam. St 2-winged, subsimple; Irs. linear-oblong, obtuse, ses- 

 sile ; flowers in a leafless, compound cyme. Ga. to Fla. and La. (No. 6, ft. ?) 



15 II. nudiflornm MX. St. and branches 4-angled and winged ; 1 vs. ovate-lanceo- 

 late or oblong, obtuse, sessile: cyme leafless, peduncled ; sep. linear; capsule almost 

 3-celled. it Wet. Penn. to La. and Ga. 1 2f. Leaves 2'. thin. 



16 H. spluerocarpon MX. St. obscurely 4-sided ; Ivs. linear-oblong, obtuse, with 

 a minute callous tip ; sep. ovate, mucronate ; caps, globular. 24 Rivers, W. If. Fla. 7". 



17 H. adpressum Bart. St. 2-winged above; Ivs. linear-oblong, half erect; cymca 

 few-leaved ; petals obovate. u R. I. to Ark. 



1 8 H. dolabriforme Vent. St. scarcely 2-edged above ; Ivs linear-lanceolate, 

 spreading ; fls. in a leafy, fastigiate cyme ; pet. very oblique (ilolabriform). H Ky.Tenr. 



1 9 H. angulosiim MX. Herb smooth ; st. acutely 4-cornered ; Ivs. oblong-lanceo- 

 late, acute : cymes leafless ; style distinct, thrice longer than the ov. it N. J. to Fla. 



20 H. ellipticum Hook. Herb smooth ; st. quadrangular, simple ; Ivs. elliptical, ob- 

 tuse, somewhat clasping, pellucid-punctate ; c}'me pedunculate ; pep. unequal ; style 

 united to near the summit, as long as the ovary, is. Can. to Pa. If. Flowers 6". 



21 H. graveolens Buckley. Stem terete, smooth; leaves oblong-ovate, clasping; 

 sepals and petals narrow ; styles 3. 11 High Mts., N. Car. Strong-scented. 



22 H. pilosum Walt. Rough-downy; stem simple, terete, virgate ; Ivs. ovate-lanco> 

 olate, appressed. clasping, acute ; styles distinct. Pine-barrens, South. 1 2f. 



23 H. miitilum L. Stem square, branched; Ivs. ovate, 5-veined, clasping, obtuse; 

 cymes leafy ; pet. shorter (1") than sep. ; sta. 612. (J) Damp sandy soils. 39'. Com. 



(3. g- 1/ in mint /i u in. Strict, simple or branched, cy. only bracted. Del., Penn. (Porter). 



24 H. Canadense L. Stem quadrangular, branched ; Ivs. linear, attenuated to the 

 base, with pellucid and also with black dots, rather obtuse ; petals shorter than the 

 lanceolate, acute sepals ; stamens 5 10. (T) Wet sandy soils. Capsule red. h' 12'. 



25 H. Sarothra MX. Stem and branches filiform, erect, and parallel; Ivs. very ml 

 nute, subulate; flowers sessile ; stam. 5 10. (T) Sandy soils. 4 12'. Fls. minute. 



26 H. DriiminC'iidil T. & G. Branches alternate ; Ivs. linear, very narrow; flow 

 ers pedicellate ; stamens 1020. (T) Dry. 111. and South. If. Leaves 6". 



3. ELODEA, Adams. ^E\w8^, marshy; from the habit.) Sep. 5, 

 equal. Pet. 5, equilateral, imbricated in bud. Stam. 9 (rarely more), tria- 

 delphous, the sets alternating with 3 orange-colored glands. Styles 3, dis- 

 tinct. Capsule 3-celled. 1 Herbs with pellucid-punctate leaves, the axils 

 leafless. Flowers dull orange-purple. July Sept. 



1 E. VIrginica Nutt. Stem erect, somewhat compressed, subsimple; leaves oblong, 



amplexicaul : stamens united below the middle, with 3 in each set. Swamps. If. 



2 E. petiolata Ph. Leaves oblong, narrowed at base into a petiole ; flowers mostly 



in 3's, axillary, nearly sessile ; filaments united above the middle ; caps, oblong, much 

 longer than the sepals. Swamps, S. States, N. to N. J. Flowers smaller (4"). 



OEDER XVII. DROSERACE^E. SUNDEWS. 



Herbs growing in bogs, often covered with glandular hairs, with leaves 

 alternate or all radical, mostly c.rcinate (rolled from top to base) in verna- 

 tion. Flowers regular, hypogynous, 5-merous, the Sepals, Petals, and Sta- 

 mens persistent (withering). Ovaries compound, 1-cellecl, with the Style* 

 and Stigmas variously parted, cleft, or united. Seeds GO in the capsule, 

 albuminous. Embryo minute. 



* Stamns 5. Styles distinct. Seeds on the valves of the cai>snle ................. DROSERA. I 



* Stanic is H> 15. Styles unite<l. Seeds all tit the base of the cell . 



