52 NORTH AMERICAN FLORA [VoLuME 17 
Beak erect. 
Basal lobes of the leaf-blades acute or acuminate. 
Achenes with thin very unequal wings, the sharp 
beak over the outer edge of the ventral wing. 24, S. brevirostra. 
Achenes with thick nearly equal wings, the blunt 
beak over the inner edge of the ventral wing. 25, S. cuneaia, 
Basal lobes of the leaf-blades rounded or obtuse. 26. S. hebetiloba, 
Achenes prominently long-beaked. 
Beak horizontal. 
Inflorescence-rachis, pedicels, bracts, and sepals pubes- 
cent. 27. S. pubescens, 
Be pedicels, bracts, and sepals gla- 
rous, 
Bracts distinct; pedicels of the pistillate flowers 
short or long, but much shorter than the adjacent 
internodes. 28, S. latifolia. 
Bracts united; pedicels of the pistillate flowers 
greatly elongate, as long as the internodes or . 
nearly so. 29, S. mexicana. 
Beak erect. 
Filaments pubescent. 
Pistillate pedicels very short; sepals and bracts gla- 
brous. 21. S. rigida. 
Pistillate pedicels elongate ; sepals and bracts pubes- 
cent, 30. S. viscosa. 
Filaments glabrous. 
Achenes with the beak less than one half the length 
of the body. 24. S. brevirostra. 
«  Achenes with the beak over one half the length of 
the body. 
Basal lobes of the leaf-blades acute or acuminate. 
Achenes cuneate, usually with 2 prominent a 
facial wings. S. Engelmanniana. 
Achenes obovate or orbicular-obovate, usually 
with 1 facial wing. 32. S. longirostra. 
Basal lobes of the leaf-blades rounded. 33. S. australis. 
Achenes with tuberculate faces. 34. S. intermedia. 
Sepals of the pistillate flowers accrescent and ultimately appressed to the 
fruit-heads. S. montevidensis. 
1. Sagittaria subulata (,.) Buch. Abh. Nat. Ver. 
Bremen 2: 490. 1871. 
Alisma subulatum I,. Sp. Pl. 343. 1753. 
Sagittaria pusilla Nutt. Gen, 2: 213. 1818. 
Echinodorus subulatus Engelm. in A. Gray, Man. 460. 1848. 
Sagitiaria natans lorata A. Gray, Man. ed. 5. 494. 1867. 
Plants 2-16 cm. tall, usually emersed; leaves usually represented by rigid phyllodia 
2-12 cm. long; the blades when present linear to linear-lanceolate, 2-3 cm. long, acutish, 
shorter than the petioles; scapes shorter than the leaves or sometimes longer, the whorls 
of the raceme solitary or often 2 or rarely 3; bracts thin, 1-5 mm. long; pedicels of pistil- 
late heads 10-20 mm.-long; sepals ovate-lanceolate, obtuse, becoming 2-3 mm. long; 
corollas about 15 cm. broad; fruit-heads 6-7 mm. in diameter; achenes few, 1.5 to nearly 
2mm. long, with 3 prominent but merely undulate or sparingly toothed crests, the beak 
lateral, ascending. 
TYPE LOCALITY: Virginia. 
DISTRIBUTION : Connecticut and New York to Florida and Alabama. 
ILLUSTRATIONS : Rep. Mo. Bot. Gard. 6: pl. 13, f. J-4; Britt.& Brown, Il. Fl. f£ 206. 
2. Sagittaria lorata (Chapm.) Small. 
Sagitiaria natans Michx. Fl. Bor. Am. 2: 190. 1803. NotS.xafans Pall. 1776. 
Sagitiaria natans lorata Chapm, Fl. S. U.S. 449. 1860. 
? Sagittaria natdns (?) gracillima . Wats. in A. Gray, Man. ed. 6. 556. 1890. 
?Sagitiaria subulata gracillima J. G. Smith, Mem. Torrey Club 5: 26. 1894. 
Plants mostly submerged, sometimes greatly elongate; leaves with bladeless petioles 
or blades when present floating, elliptic, oblong or ovate-oblong, 1.5-5 cm. long, rounded, 
subcordate, or hastate-truncate at the base; phyllodia flattened, strap-like; scape elongating 
to the surface of the water or rising above it, 1-10 dm. long or more; whorls of the inflo- 
rescence one or several; bracts thin, acuminate; sepals becoming 3-4.5 mm. long; corolla 
