46 LEAFLETS. 
name of Polygonum Hartwrighti ; most of the species exhibit- 
ing salverform ocrex, this organ consisting of the usual thin 
sheath surmounted by a distinct herbaceous spreading border. 
The type of this group bears the marks subjoined. 
P. HARTWRIGHTII (Gray), Greene, Leafl. i. 24. Low densely 
leafy stems with short internodes of less than in inch, naked 
for one-third their length, otherwise invested by the ocrex, 
these appressed-bristly-hairy, the limb bristly-ciliate; leaves 
oblong to oblong-lanceolate, 34 to 5 inches long, acutish at both 
ends, glabrous above, or with a few hair-points toward the mi- 
nutely spinulose-serrulate margin, beneath glabrous except some 
scattered spinulose hairs along the midvein ; both peduncle and 
bracts of the oval spike minutely and sparsely hirtellous. 
Original specimens from Penn Yan, N. Y., by Dr. Wright, 
justify the above diagnosis. Quite the same has been distributed 
from Pownal, Vt., by Mr. Eggleston, and from near Lake Grin- ` 
nell, N. J., by Porter & Britton. 
P. apsoissa. Size and habit of P. Hartwrightit, with similar 
leaf-outline but leaves more spreading, their pubescence very 
different, upper face sparsely strigose, the hairs more copious 
along midvein and veinlets, marginal hairiness strong but ap- 
pressed, midvein and veinlets beneath either merely muricate- 
scabrous or the murications bearing each a long hair: ocreæ 
short, thin, almost hyaline, terminating very obliquely and with 
no trace of herbaceous border; peduncles of the oval spikes 
short, stout, hirtellous; bracts also strigose or hirtellous. 
Chelmsford, Massachusetts, 20 Sept., 1885, C. W. Swan, in my 
herbarium, labelled P. Hartwrightit and imitating that, but dif- 
fering from it entirely as to nature of pubescence, as well as by 
the oblique wholly sheathing ocreæ. 
P. ASCLEPIADEA. Terrestrial state; flowers unknown. Stout, 
decumbent, the several tufted stems a foot long, densely leafy ; 
nodes not swollen, internodes only ł inch long, completely in- 
vested by the cylindric striate hirsute sheaths, these all with a 
very broad spreading foliaceous erose and hirsute-ciliate border ; 
leaves apparently sessile, the petioles not produced, lanceolate, 
acute, 3 inches long, glabrous on both faces, only the midvein 
