the same situations with the former. A well marked variety, but differi 
only in the more slender habit, and less complete development of its parts. 
2, SPARGANIUM. 
Gr. oexapyavoy, a band or fillet; in reference to the long, ribbon4like leaves. 
~Spadix of flowers globose. ¢ Calyx 3—6-sepaled. 9 Calyx 3—6- 
sepaled ; utricle turbinate, acuminate, 1—2-seeded—Root 4. Fis. 
collected an several dense, roundish heads, the sterile heads above the fertile. 
1. S.frecrum. (S.ramosum. Smith.) Burr Reed. 
Les. triangular at base, their sides concave; common flower-stalks branth- 
ed; stig. 2, linear—Grows in pools and ditches, where it is conspicuous among 
other reedy plants for its globular burrs of flowers. Stem 1—2f high, flexuous, 
round, with a few branches above. Leaves 4—2f long, 4—8” wide, lmear, 
arising above the stem, triangular towards the base, and sword-form upwards, 
tapering, but obtuse. Heads of flowers light green; fertile ones 2—5, the low- 
est generally raised on a short, axillary stalk; sterile ones above, more numer- 
ous, smaller, sessile. Aug. 
2. S. smmptex. Smith. (S. Americanum. Nutt. 
Lower lvs. equal with, or exceeding the stem, which is nearly simple, 
Floral ones ‘concave at base and erect; stig. always ea, ovate oblong, oblique, 
scarcely more than half the length of the style—Ponds and lakes. Stem 1—2f 
high, simple or divided at base. Leaves mostly radical, 1—2#f by 3”, carinate 
at base. Fertile heads sessile, generally 3, below the several barren ones, with 
the simple styles conspicuous. Aug. 
3. S. narans. Michx. Floating Burr Reed. 
Lvs. floating, flat; common P sciapitmnen simple; stig. ovate, very short; 
head of sterile fis. subsolitary —L and pools, U.S. and Brit. Am. Stem 
long and slender, and, with the leaves, floating upon the surface of the water. 
Leaves thin and pellucid. Heads of fertile flowers axillary, generally 2, 
mostly sessile. Sterile cluster terminal. Aug. 
Orpver CXXXVII NATADACE—Naumps. 
Water plants, with cellular leaves and inconspicuous flowers. 
Fis. perfect or monecious. Calyz 2—4-sepaled or 0. 
Sta. definite. Ovaries 1, or 2—4, free, 1-ovuled. i simple, often sessile. 
¥r. dry, indehiscent, 1-celled, iseeded. Seed MS omy Aibumen 0. 
Geneta 9, species 16, in waters and marshes, salt and fresh, in nearly all ‘countries. 
Conspectus of the Genera. 
solitary, diclinous, monandrous. wa) Sn, che. T-pep) some 2 
0. Flowers axillary, $8 together, a sterile and fertileone. . . ti Me '? Bee 2S 
short, 2-flowered, borne on along, tortuous peduncle, . . . . . «« Ruppia- 4 
linear, bearing the monecious flowers in a double row. Sia? > a ot ae 1 
Spike (cylindric, covered with perfect, tetramerous flowers. . . + 2 | ° Potamogeton. 5 
1 ZOSTERA. 
Gr. {wernp, agirdle ; alluding to its ribbon-like leaves. = 
Spadix linear, bearing the separated flowers in 2 rows on one side; 
perianth 0. & Anther ovoid, sessile, parallel to the ovary. Q Ova- 
ries 2, ovoid; style bifid ; utricle 1-seeded. 
Z. marina, Sea Wrack-grass. 
St. trailing, throwing out tufts of fibrous roots at the joints; branches 
floating, simple; /vs. alternate, sired entire, sheathing at base, arab <2 feet 
in length ; receptacle or spadiz linear, flat, pale green, 2’ long, issuing from a 
cleft in the base of the leaf, covered in front with a Roahie series of naked 
flowers.—2 Habits aquatic, growing in the sea on sandy banks and shallows 
(Maine to Ga.), and is thence washed upon the shore by the waves. Like 
other sea-weeds, it is gathered formanure. Aug. 
2. NAJAS. 
Gr. vaw, to flow; hence Nas, or Nacdes, Nymph of the waters; from the habitat. 
Flowers often d 2. of Calyx cylindric, 2-cleft ; stamen 1 (rarely 
