239 
blades rounded at the apex and tapering into a short petiole, 
three-nerved. Style as long as or longer than the fruit, erect, 
deciduous or persistent. Fruit very small, sessile or on a minute 
peduncle, entirely unlike that of any other species, being only 
about 3? mm. long by ¢ mm. broad, the lobes separated by a deep 
and broad apical notch, the groove between them small, the 
margins obtuse and wingless, contracting at the base into a 
raised, gibbous projection. The dried plant has a fragrance like 
that of No. 1. 
Florida, Arkansas, Louisiana, Texas. Also in Cuba (Wright., 
Rugel, No. 234). 
3. Proserpinaca. L. Act. Up. 81 (1741). 
Well-known marsh or aquatic plants readily recognized by 
their three-celled bony triquetrous fruit. It should be noted, 
however, that the flowers are in rare cases four-parted, and when _ 
this occurs, the fruit is four-gonous, four-celled and four-seeded. 
The inflorescence is in the axils of the emersed leaves. Two 
species only are known, confined to North America. 
Emersed leaves linear or linear-lanceolate, sharply serrate, 
the submerged pectinate or pectinate-pinnatifid. Fruit 
sharply three angled, the faces. concave and usually 
smooth. 1. P. palustris. 
* Leaves all pinnate or pinnatifid. Fruit smaller, angles 
obtuse, the faces flat or slightly convex, apt to be 
wrinkled or tuberculate. 2. P. pectinata. 
1. P. palustris. L. Sp. Pl. 88 (1753). 
Trixis palustris. Gaert. De Fruct. 115, t. 24 (1788). 
The submerged plants of this species may be distinguished 
from those of the following by the fact that the segments are 
commonly denticulate, and bear minute black spines in their 
axils, while this seldom occurs in the other. 
Common in Canada, New England south to Florida, New 
Mexico and Gautemala, west to Minneapolis and Iowa, Cuba 
(Wright). 
2. P. pectinata, Lam. Ill. t. 50, f. 1 (1791). 
P. pectinacea. Torr. and Gray Fl. 1, 76 (1838). Gray Man. 
Ed. 6 182 (1890) not Lam. 
This plant grows about as high as the preceding (20-50 cm.) 
