4i.S AUISMACE.E. (WATKU-l'LAN TAIN lAMIl.V.) 



short. Aclu'iiium 1 -sri-ded, 2 - O-keclt'd on tlic back. — IJoots fil)rou<s. Leaves 

 mostly oval or eonlatc, nerved, shorter than the sea|)C. I'lowers while. 



1. A. FlantagO, L. Leave; lon<^-]ietioled, ovate or olilon;;, acute, rounded 

 or corchite at tlie ha.se, 3 - 9-nerved ; jjaniele hirjjje, lax, the whorled hranehes and 

 elongated filit'oriu jjedieels hracted at the base; aehenia obtuse, 1.5 -'20 in a 

 whoil. (A. triviaiis, and A. parviflora, Pursh.) — iJitches and inarj^ins of ponds 

 in the upper districts, (jieorj;ia, and northward. July and Aug. — Leaves 2' -4' 

 long. Pauiclc l°-2° long. 



3. ECHINODORUS, Eichard. 



Flowers perfect, mostly in whorled racemes. Sepals 3. Petals 3, imbricated 

 in the bud, w ithering. Stamens few or numerous. Ovaries few or many, im- 

 bricated, forming ribbed aehenia in fruit, usually beaked with the persistent 

 style. — Herbs, with petiolcd nerved leaves. Heads mostly bur-like. 



1. E. parvulus, Engelm. Small; leaves lanceolate or spatnlate, mostly 

 acute, finely nerved and somewhat pinnately-veined, commonly shorter than the 

 single or clustered 1-6-flowered scapes; flowers mostly clustei-ed or umbelled, 

 on long bracted pedicels which are recurved in fruit, stamens 9 ; aehenia few, 

 shorter than the ovate sepals, obovate, flattened at the sides, and smrounded 

 with .') prominent ribs, beaklcss. — Margins of shallow jionds. Middle Florida, 

 and westward. July and Aug. — Scapes l'-4' high. Aehenia black and 

 shining. 



2. E. rostratUS, Engelm. Leaves varying from lanceolate to ovate, acute 

 at each end, or rounded or cordate at the base, 5-ncrved, about as long as the 

 petiole ; scape rigid, erect, longer than the leaves; whorls few ; pedicels erect or 

 spreading ; sepals ovate, many-nerved, shorter tlian the oval bur-like head ; sta- 

 mens 12; style longer than the ovary; aehenia numerous, strongly 3-ribbed on 

 the back, with fainter lateral and intermediate ribs, beaked with the long persist- 

 ent style. — South Florida, and westward. — Scape simple, 3'- 8' high, or oc- 

 casionally 2° high and panieulately branched. Leaves l'-2' long. Flowers 5" 

 wide. 



3. E. radicans, Engelm. Leaves large, long-petioled, ovate, cordate or 

 tnincate at the base, obtuse, 7 -9-ribbed ; scape elongated, prostrate, rooting and 

 proliferous; whorls several, remote; pedicels slender, spreading, or recurved; 

 stamens about 20 ; style shorter than the ovary ; heads globose, longer than the 

 many-nerved sepals ; aehenia very numerous, short-beaked, ribbed and slightly 

 denticulate on the back. (Alisma radicans, -Nutt.) — Swamps, Florida to North 

 Carolina, and westward. July - Sept. — Scape 2° - 4° long Leaves 3' - 8' long. 

 Flowers 8" -12" wide. 



4. SAGITTARIA, L. Arrow-grass. 



Flowers monoecious, in a whorled raceme, the upper ones sterile. Sepals 3, 

 persistent. Petals 3, imbricated in the bud, withering. Stamens few or many. 

 Ovaries crowded in a globular head. Aehenia flat, membranaceous, winged. — 

 Marsh or aquatic herbs, with scape-like stems, and variously-shaped nerved and 



