382 CALLITRICHACEAE. [Vot. II. 
1. Callitriche Atstini Engelm. Terrestrial Water-Starwort. (Fig. 2339.) 
Callitriche terrestre Raf. Med. Rep. (II.) 5: 358. 1808? 
Callitriche deflexa var. Austini Hegelm. Ver. Bot. Ver. Brand. 
9:15. 1867. 
C. Austini Engelm. in A. Gray. Man. Ed. 5, 428. 1867. 
Tufted, the branches spreading on the ground or ascend- 
ing, %4’-2’ long. Leaves spatulate or obovate, 3-nerved, 
1%4//-2’’ long, about 1’’ wide, obtuse, tapering at the base 
into a short margined petiole, destitute of stellate scales; 
fruit about 1/’’ long and nearly %4’’ broad, deeply notched 
at both ends, its lobes with a narrow marginal wing or 
raised border, with a deep groove between them; peduncle 
shorter than or slightly exceeding the fruit; styles per- 
sistent, not longer than the fruit, spreading or reflexed. 
In damp, shaded places, southern New York and northern 
New Jersey to Ohio and Missouri, south to Tennessee, Louis- 
iana, Texas, and Mexico. July-Sept. The dried plant ex- 
hales a pleasant odor like Melilot. 
2. Callitriche palustris ,. Vernal Water-Starwort. Water Fennel. (Fig. 2340. ) 
Callitriche palustris L. Sp. Pl. 969. 1753- 
Callitriche verna I,. Fl. Suec. Ed. 2, 4. 1755. 
Callitriche vernalis Koch, Syn. Fl. Germ. Ed. 2, 245. 1837. 
Aquatic or growing in the mud, stems 2/-10’ long. Sub- 
merged leaves linear, 1-nerved, retuse or bifid at the apex, 
5/’-10’’ long; emersed or floating leaves obovate, obtuse, 
truncate or retuse at the apex, narrowed at the base into 
a margined petiole, dotted with stellate scales; aquatic 
forms occur with the leaves all linear; fruit 2-bracted, 
oval, %4//-1’” long, about one-half as broad, nearly flat on 
the face, slightly notched at the apex, winged only to- 
ward the apex, or all around, separated by a deep groove. 
Mostly in cold or running water, apparently occurring 
nearly throughout the United States and Canada. Also in 
South America, Europe and Asia. July-Sept. 
3. Callitriche netere siete Pursh. Larger 
Water-Starwort. (Fig. 2341.) 
Callitriche heterophylla Pursh, Fl. Am. Sept. 3. 1814. 
Similar to the preceding species, either aquatic or 
growing in the mud. Fruit smaller, mostly obovate, 
usually slightly less than 14’ long, and about the same 
breadth, broadly notched at the apex, thick, plano-con- 
vex, almost ventricose at the base; lobes obtusely angled 
with a small intervening groove, wingless, or with a 
narrow wing or raised border on the margins; styles 
usually longer than the fruit, erect. 
In ponds and slow streams, New England to Florida, west 
to the Northwest Territory, Missouri and Louisiana; of more 
southerly distribution than the last. Also in Colorado. 
July-Sept. 
4. Callitriche bifida (I,.) Morong. Autumnal 
or Northern Water-Starwort. (Fig. 2342.) 
Callitriche palustris var. bifida I,. Sp. Pl. 969. 1753. 
Callitriche autumnalis J,. Fl, Suec. Ed. 2, 4. 1755. 
Callitriche bifida Morong, Mem. Torr. Club, 5: 215. 894. 
Entirely submerged. Leaves crowded, linear or linear- 
lanceolate, clasping at the base, retuse or bifid at the 
apex, I-nerved, 5’’-8’’ long, without stellate scales; fruit 
sessile, or raiely minutely pedunculate, orbicular or 
slightly narrower than long, %//-1’’ in diameter, its 
lobes separated by a deep groove and broadly winged on 
the margins; styles as long as the fruit, or shorter, soon 
deciduous; bracts none. 
In flowing water, Quebec and Lake Champlain to Michi- 
gan, Manitoba and Oregon, south in the Rocky Mountains to 
Colorado. Also in Europe and Asia. July—Sept. 
