74 The Botanical Gazette. [February, 
style. The anthers are exserted about 2™ beyond the mouth 
of the tube, the alternate ones being somewhat shorter. The 
stigma is advanced about 2™ further. 
In a bud which had just begun to open I found that the 
flowers had the anthers reaching just to the mouth, but the 
stigmas advanced 2™" beyond. The anthers were closed but 
the stigmas were receptive. There was thus an appearance 
of proterogyny, but it must be short-lived, for all of the other 
flowers which I observed had the anthers dehiscent, the lar 
ger ones, however, shedding their pollen first. The arrange 
ment for cross-pollination is the simple one, common in pet — 
dulous flowers, of the stigma being in advance of the anthers _ 
Pollination between flowers of the same plant may occur, but 
I think there is little chance of self-pollination. 
As noted above, the calyx has obscure lobes, and my & _ 
amination of early cases, in which the open mouths of the 
tubes were crowded with the swollen anthers, leads me 
believe that the abortion of the lobes is correlated with the 
fact that the young flowers are protected by the scales which 
form the common envelope of the leaf-bud and the flows 
cluster. 
The pendulous position of the flowers, the comparatively 
deep, narrow tube, and the early blooming time convince m — 
that the flowers are adapted to the smaller bees. The fol 
lowing list of visitors, observed March 21st, confirms this 
view: 
HyMENoPTERA—A fide: (1 i - (2) C. tejonens® 
Cr. g: (3) Osmia im the a ae ie é; Vndrtt 
ide: (5) Halictus sp. 9; (6) H. zephyrus Sm. ¢; (7) H. confusus Sm. 
(8) Augochlora labrosa Say 9; (9) Andrena rugosa Rob. ¢; (10) Collet 
inaequalis Say é—all s. 
EPIDOPTERA—WVymphalide: (11) Vanessa antiopa L.., s. of 
EUPHORBIA L.—As in the case of Polygonum, 1 mt” 
remarks upon the mode of pollination and references to the 
literature. 
EUPHORBIA COROLLATA L.—The stems grow from 6:8 | 
10" high and are terminated by large umbel-like clusters with 
white involucres which make it the most conspicuous ° of 
Euphorbias. | 
It was observed in bloom from May 24th to Sept. 27 . 
The following list, consisting mainly of flies, on which Qe 
plant seems to depend, with the exception of no. I, W% : 
served on July 25th: 
