496 TWO NEW DICGCIOUS GRASSES OF THE UNITED STATES. 
X. SPECIES OF ALISMACE/. 
From Torrey’s BoTANy oF THE Mexican Bounpary (Report, Etc., Vol. I. Parr 2, 1859). 
SaGiTTaRia CALycINA, Engelm. mss. var. a. MAXIMA, var. 8. MEDIA, Var. y. FLUITANS. S. LoNGILOBA, Engelm. [212] 
in herb. CS. svmplez). 
From Gray’s MANUAL OF THE BoTANy OF THE UNITED STATES. 
First Epirion, 1848. 
ECHINODORUS, Richard, Engelmann. E. susunatus, Engelm. (Alisma subulata, L.) [460]. E. rostratvs, 
Engelm. (Alisma, Nutt.). E. rapicans, Engelm. (Sagittaria, Nutt.). SAGITTARIA VARIABILIS, Engelm. [461]. 
Sreconp Eprrion, 1856.* 
Ecuinoports PARVULUS, Engelm. E. RostRatus, Engelm. E. Rapicans, Engelm. 
Sagittaria faleata, Pursh. 2. S. VARIABILIS, Engelm. (S. sagittifolia, Amer. auth., &c.)— Var. oB- [439] 
Tusa (S. obtusa, Willd.). — Var. Latrroxta (S. latifolia, Willd.), — Var. DIVERSIFOLIA. — Var. SAGITTIFOLIA. — 
Var. ANGUSTIFOLIA. yohig GRACILIS (S. gracilis, vitae 3. S. heterophylla, Pursh. — Var. ELLIPTICA, — Var. RIGIDA 
(S. rigida, Pursh).— Var. ANGUSTIFOLIA. — Var, TANS. 4. S. simplex, Pursh (S. acutifolia, Pursh, &c.). 
S. pusilla, Nutt. ons subulata, Pursh). 8. sca Michx. [440] 
Firta Epirion, 1868. 
In addition to the species of the previous edition, this contains Sagittaria ci i L. (S. faleata, Pursh), 
S. variabilis, Engelm., var. HASTATA (including S. hastata, Pursh). — Var. PUBESC S. pubescens, Mu 
S. catyctna, Engelm. — Var. SPONGIOSA. — Var. FLUITANS. — Var. GRANDIS. S. graminea, Michx. (S. aeitl- [494] 
folia, Pursh. SS. simplex of Amer. authors, not of Pursh). — Var. PLATYPHYLLA. 
From ADDITIONS TO THE FLORA OF THE UNITED Srates (BULL. Torrey Bot. Crus, Vou. 1X. 1882). 
Sagitturia natans, Michx., has been noticed by Mr. C. E. Faxon, since a number of years in Charles River, [4] 
Mass., ‘at the depth of 2 to 4 feet, and entirely above the influence of tide-water,” and also, as he informs me, in 
Neponset and in Ipswich Rivers, where Mr. J. Robbinson found it. It flowers there from the middle of June to the 
end of July, but never perfects fruit, and thus is evidently not at home in those northern waters, where it has a preca- 
rious existence by stolons ; these can only winter where deep water protects them from frost. The seed was probably 
first brought there from the South by water-fowl who disseminate so many water-plants. Scape and phyllodia 2-4 
feet long, barely reaching the surface of the water, leaf-blades vial developed, and then linear-lanceolate; raceme as 
well as pedicels often elongated in order to reach air and light; flowers 6-7 lines wide, opening in furenoon, submerged 
again toward evening, only one or two of the lowest whorl ‘eitila, the others all male; male flowers with 6 exterior 
and 1 or 2 central stamens; filaments about as long as the nearly orbicular anthers, bulbous at base and smooth ; 
a of the female Sineees numerous, minute, erect, style as long as the ovary ; fruit (never matured in the North) 
southern specimens marked by several (5 or 7) denticulate crests on back and sides. Sagittaria — Pursh, 
nS be considered as a subterrestrial form of this species, distinguished only by its size, and by a 3-creste 
achene. S. graminea, with which I had confounded the northern form, is aria by the great saad of [5] 
stamens and the papillose filaments, even where the fruit cannot be comp 
XI. TWO NEW DICECIOUS GRASSES OF THE UNITED STATES. 
FroM THE TRANSACTIONS OF THE ACADEMY OF SCIENCE oF St. Louis, Vou. I. 1859. 
THE grasses, though usually hermaphrodite, show a tendency to a separation ofethe sexes, [431] 
and polygamous flowers are not rare among them. About 25 to 28 genera, one-twelfth of the 
whole number known, comprising only 75 to 80 species, about one seventy-fifth of all species,’ are 
described as having moneecious and mostly heteromorphous flowers. 
* The entire account of Echinodorus and Alisma in this gelm. & Gray (S. graminea, Nutt.) is oo by Gray 
and the fifth edition was contributed by Dr. Engelmann, but in Pl. Lindheim., part 1, pp. 26, 
the work is so easily accessible that only an enumeration of 1 In the latest work on Grasses, Steudet’s _— pub- 
the species is eitinialeds here. Sagittaria stolonifera, En- lished in 1855, about 6,000 species of are d 
