SAGITYARIA. CXXXVII. ALISMACE. 527 
Me * 
aggregated, and becoming, in fruit, as many compressed, margined 
achenia collected into a globose head.—% acaulescent. Lvs. radical, 
generally sagittate. ls. in verticids of 3, the sterile ones near the swm- 
mit of the scape, fertile below them. 
1. S. saGitTironia. Arrowhead, ; 
Lvs. lanceolate, acute, sagittate, lobes lanceolate, acute ——A curious aquatic 
plant, conspicuous with its large white flowers among the rushes and sedges of 
sluggish waters, Can. and U.8. Root fleshy and farinaceous. Leaves 3—10/ 
long including the lobes which are nearly half this length, 3—4 or 5’ wide, 
smooth ahd entire. Scape 1—2f high, branching, obtusely 3-angled. Flowers 
generally in 3s, the upper ones barren. Petals 3, large, roundish, white and 
very delicate. July, Aug.—The leaves, &c., are exceedingly variable, and Dr. 
Torrey has appended the following, as varieties: 
B. latifolia. Ls. broad-ovate, rather obtuse, with straight, ovate, slightly 
acuminate lobes. 
y. hastata. Lvs. oblong-lanceolate, acute, with spreading, lanceolate, long, 
acuminate lobes; ls. mostly dicecious. 
6. gracilis. Lws. linear, with linear, very long, acute and spreading lobes. 
e. pubescens. Plant distinctly pubescent, in all its parts; dvs. and their lobes 
ovate. 
2. S. ricipa. Pursh. Brittle-leaved Arrowhead. 
Tvs. narrow-lanceolate, carinate, rigid, very acute at both ends; scape 
branching —N. York. Growing In water even to the depth of 7 feet, accord- 
ing to Dr. Beck. Leaves remarkably dissimilar to those of the foregoing spe- 
cies, /—6’ in length, one in width, thick and brittle, and on stout, rigid petioles, 
prolonged according to the depth of the water. Flowers numerous and large, 
with 3, white, rounded petals; fertile ones on short peduncles. July. 
3. S. HETEROPHYLLA. Pursh. Various-leaved Arrowhead. 
Iws. smooth, linear and lanceolate, acute at each end, rarely some of them 
elliptical and sagittate, with lobes-tinear and divaricate; scape simple, few-flow- 
ered, fertile flowers subsessile—Muddy shores, Middle States. Leaves 2—4/ 
long, 4 as wide, on petioles rather longer than the scape which is seldom a foot 
high. Flowers few, the three lower ones fertile and very nearly sessile, all with 
roundish bracts at base. July. 
4, S. sIMPLEX, (acutifolia and graminifolia. Pursh.) Linear Sagittaria. 
Lvs. erect, simple, linear and lance-linear, sheathing, hyaline and cellular 
at base, attenuated to a long, acute point; scape simple, longer than the leaves; 
jis. & or # Q, in whorls of 3, 4 or 5, subterminal and terminal ; séa. in the bar- 
ren flowers 12—15; bracts minute.—Muddy shores of ponds and rivers, Me.! to 
N. J., N. ¥.! W. to Ill. Aspecies almost as variable as S. sagittifolia, to which 
it is indeed appended by Hooker as another class of varieties. Leaves 4—7’ 
high, usually very narrow. Scape 5—8’ high. Flowers 9—18, 8—9” diam. 
Petals roundish, white. 
5. S. ostusa. Willd. Blunt Arrowhead. 
Ivs. broad-ovate, sagittate, rounded and mucronate at the apex, lobes ob- 
long, obliquely acuminate, approximate and not spreading; fls. g\Q: scape 
simple, the sterile branched at the base; bracts ovate, acute.—Ditches, ponds 
and marshes, Penn. to Va. W.toOhio. Juice milky, exuding from the wounded 
stem or leaves, and hardening into a pellucid gum. Scape 1—2f high. Leaves 
on long, radical, channeled petioles, lamina 3—5/ by 2—3/. Flowers white, showy. 
6. S. pusttya. Nutt. Puny Arrowhead. 
Petioles (leaves?) short, linear, obtuse, summits only foliaceous; scape 
simple, shorter than the leaves; fis. few, fertile one solitary, deflexed; sta. mostly 
7.—A diminutive species on muddy banks, N. Y. to Ga. Leaves rarely subu- 
late, an inch or two long, less than a line wide. Scape 2—4’ high. Flowers 
4—7, the lowest one only fertile. Aug. 
7. S. natans. Michx. Floating Sagittaria. — 
Las. Ta oval-lanceolate., shines 3-veined, tapering to the base, lower 
