50 ORDEB 17. DROSERACE^E. 



14 H. clstifolium Lam. St. 2-winged, subsimple; ITS. linear-oblong, obtuse, ee 

 sile ; flowers in a leafless, compound cyme. G-a. to Fla. and La. (No. 6, /3. ?) 



1 5 H. nudiflorum MX. St. and branches 4-angled and winged ; Ivs. ovate-lanceo- 

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

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



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

 a minute callous tip ; sep. ovate, mncronate ; caps, globular, u Rivers, W. If. Fls. 7". 



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

 few-leaved ; petals obovate. 11 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 Cdolabriform). it Ky.Tenr. 



19 H. angulosum MX." Herb smooth ; st. acutely 4-cornered; Ivs. oblong-lanceo- 

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



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

 tuse, somewhat clasping, pellucid-punctate ; cyme pedunculate ; sep. unequal ; style 

 united to near the summit, as long as the ovary. 11 Can. to Pa. If. Flowers 6". 



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

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



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

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



33 H. mutilum L. Stem square, branched ; Ivs. ovate, 5-veined, clasping, obtuse ; 



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



/3. g-ymndnthnm* 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 510. CD Wet sandy soils. Capsule red. 6 12'. 



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

 nute, subulate ; flowers sessile ; stam. 510. Sandy soils. 412'. Fls. minute. 



26 H. Drummondii T. & G. Branches alternate ; Ivs. linear, very narrow: flow 

 ers pedicellate ; stamens 1020. Dry. 111. and South. If. ' Leaves 6". 



3. ELODEA, Adams. ^EXwSrjS, 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. it Herbs with pellucid-punctate leaves, the axils 

 leafless. Flowers dull orange-purple. July Sept. 



1 E. VIrginica Nntt. Stem erect, somewhat compressed, snbsimple ; leaves oblong, 



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



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



in 8'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"). 



ORDER XVII. DROSERACE^E. SUNDEWS. 



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

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

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

 mens persistent (withering). Ovaries compound, 1-celled, with the Stylet 

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

 albuminous. Embryo minute. 



* Stamens 5. Styles distinct. Seeds on the valves of the capsule .................... DROSF.RA. ] 



* Stam e is 10 15. Styles united. Seeds aD. at the base of the call 



