NEW PLANTS FROM NORTH DAKOTA. 205 
dark sage-colored seeds quadrangular with prominent angles, 
the slightly ovate outline approaching the cylindrical form, or 
with an unequal contour, presenting the straight line on one 
side and the curve of the ovate line on the opposite, the space 
between the angles conspicuously rugose and depressed be- 
tween the rugae. 
space needed for its entire expansion. 
seeds are turgid and very finely rugulose, with deep and irregu- 
lar pits, and the apex of the leaf is retuse (vide Pttonia II, 
plate 1). C. serpyllifolia (Pers.) Small, differs in having oval, 
retuse leaves, crenulate at the apex, is procumbent (Persoon. 
Synopsis Platarum, Vol. II, p. 14 ]1807[, and has an angled, 
in the type almost winged stem (vide, Pittonia, l. c.). C. 
neo-mexicana (Greene) is erect, with branches acutely angled, 
with elongated, sharply pointed seeds, the two ventral facets 
being concave, and the lobes of the involucre entire or 2-3-cleft. 
C. consanguinea (Engelm.) is rather erect, the apices of the 
leaves are obtuse and sharply serrate, the lobes of the involu- 
cres are lacerate, the seeds are quite dark, rather ovate and 
blunt on the angles, and the stems and leaves have a more or 
less red coloration. C. glyptosperma (Engelm.) Small, is erect 
Spreading, has linear-oblong, usually faleate and toward the 
apex slightly serrulate leaves, and quadrangular seeds with 5 
or 6 sharp transverse wrinkles and no pitting between these. 
The natural disposition of the plant is to spread prostrate 
upon the ground, but even the least obstacle in its way pre- 
vents it from coming there. In this respect it is unlike most 
other creeping plants, who work their way easily around or 
between the obstructions. Certain natural conditions force 
the plant to take the ascending course, and it then appears as 
the following variety: 
C. aequata var. claudicans nov. var. 
Ascending, freely branching; the branches are drooping, 
more or less. It grows on level ground, roadsides, etc. There 
is something in the way, as for example one or two Stems of 
grass or other plants, a dead leaf, etc., preventing it from 
spreading over the ground and on account of its aversion to 
“crookedness,” it is forced to grow in a direction diametrically 
contrary to its native impulse. But it drops its branches 
longingly toward the ground which they can never reach. This 
