MyRrIoPHYLLUM. LV. CGNAGRACEA. 267 
delicate plant, common in wet, rocky woodlands in mountainous districts, N. 
Eng., Brit. Am. W.to Or. Stem diaphanous, juicy, 5—10'high. Leaves i— 
2 long, ? as wide, acute or acuminate, with small, rémote teeth, pale green and 
shining. Flowers white, rarely reddish, minute, in terminal racemes. Jl. 
SuporDeR,_HALORAGE £. 
Plants small, aquatic. Flowers minute, axillary, sessile. Calyx entire, or 
3—4-lobed. Petals 3—4, often 0. Stamens 1—8, inserted with the petals into 
the summit of the calyx. Ovary inferior, 1—4-celled. Fruit dry, indehiscent, 
1—4-celled. Seed pendulous, 1 in each cell. 
8. PROSERPINACA. 
Lat. Proserpina, a Roman goddess; from some fancied resemblance. 
Calyx tube adherent to the ovary, 3-sided, limb 3-parted; petals 
0; stamens 3; stigmas 3; fruit 3-angled, 3-celled, bony, crowned 
with the permanent calyx.—% Aquatic. Lvs. alternate. 
1..P. pantustris. Spear-leaved Mermaid-weed. 
Lvs. linear-lanceolate; sharply serrate above the water, those below (if 
any) pinnatifid.—Ditches, swamps and ponds, often partly submersed, N. Eng.! 
to Ark. Root creeping. Stems ascending at base, 6—20’ high, striate, round- 
ish. Leaves 10—15'’ by 2—3", acute at each end, lower ones on short petioles, 
and if growing in water, pinnatifid with linear segments. Flowers greenish, 
sessile, 1—3 together in the axils of the upper leaves, succeeded by a very hard, 
triangular nut. Jn. Jl. 
2. P. pectinacea. Lam. (P. palustris, 8. Mz.) Cut-leaved Mermaid-weed. 
Ivs. all pectinate, with linear-subulate segments; fr. obtusely 3-angled. 
—Sandy swamps, in Ms.! (rare) S. to Flor. Stems 5—10’ high, ascending at 
base from long, creeping roots. Leaves all finely and regularly divided into 
very narrow segments. Styles 0. Stigmas attenuate above. Fruit rather 
smaller (less than 1” diam.) thanin P. palustris, rugose when mature. Jl. Aug. 
9 MYRIOPHYLLUM. Vaill. 
Gr. pvptos, a myriad, pvdXov, aleaf; from the numerous divisions of the leaf- ae 
Flowers £, or frequently %; calyx 4-toothed in the 9 and Q, 4- 
parted in the 3’; petals 4, often inconspicuous or 0; stamens 4—8; 
stigmas 4, pubescent, sessile; fruit of 4 nut-like carpels cohering by 
their inner angles —% Swbmersed, aquatic herbs. Submersed lvs. parted 
into capillary segments. Upper fis. usually &, middle ones ©, lower 2. 
1, M. spicatum.—Spiked Water-Milfoit. 
Lvs. in verticils of 3s, all pinnately parted into capillary segments; fis. 
in terminal, nearly naked spikes; floral lvs. or bracts ovate, entire, shorter than 
the flowers ; lowest ones subserrate and larger; pet. broadly ovate ; sta. 8; carpels 
smooth.—N. Eng. to Ark., in deep water, the flowers only rising above the sur- 
face. Stems slender, branched, very long. Leaves composed of innumerable, 
hair-like segments, always submerged. Flowers greenish, sessile. Jl. Aug. 
2. M. verticinuatum. Water-Milfoil. 
Ias. in verticils of 3s, lower ones pinnately parted into opposite, capillary 
or setaceous segments; fis. in terminal, leafy spikes; floral vs. pectinate-pin- 
natifid, much longer than the flowers; pet. oblong-obovate; sta. 8; carpels 
smooth.—In stagnant water, Can. to Flor. W. to Oregon. Stem long, less slen- 
der than in the last, only the upper part emerging. Flowers small, green, ax- 
illary, with conspicuous floral leaves. Sepals acute. Anthers oblong. Jl. Aug. 
3. M. HETEROPHYLLUM. Michz. (Potamogeton verticillatum. Walt. 
Lvs. in verticils of 5s, the lower ones pinnately parted into capillary 
lobes ; spikes terminal, nearly naked ; floral lvs. ovate-lanceolate, serrate, longer 
than the flowers, crowded; pet. oblong; sta. 4—6; carpels scabrous, with 2 slight 
ridges on the = sluggish water, Can. to Flor. and Tex., rare. Stem 
2 * 
