274 The Botanical Gazette. [September, 
the flowers visited by: Syrphid@: (1) Baccha elongata F.; (2) 
Ascia podagrica F.; (3) Melanostoma mellina L.; Muscide: 
(4) Musca domestica L.; (5) Anthomyia sp. 
July 2nd, 4th and 1othI saw the flowers visited by: 
Hymenoptera—Andrenide (1) Augochlora pura Say 9% 
and c. p., freq.; (2) Halictus 4-maculatys Rob. 4 9, s. and ¢ 
p., ab.; (3) H. confusus Sm. 9, s. and c. p.; (4) H. pectinatus 
Rob. 9, c. p.; Chalcidide: (5) Spilochalcis debilis Say, s. 
Diptera—Bombylide : (6) sp. ; (7) Hemipenthes sinuosa W4., 
f. p.; Syrphide: (8) Allograpta obliqua Say; (9) Mesograpta 
marginata Say; (10) M. geminata Say—all sucking. 
MOLLUGO VERTICILLATA L. °__«‘An immigrant from farther 
south.”—The plants are much branched, the branches lying 
flat on the ground and bearing small, white flowers, whichare 
numerous but not enough to form conspicuous clusters. 
The flowers are erect, expand horizontally and measure 
about 4 mm. across. The three anthers rise to the level of 
the three stigmas and alternate with them. 
In case of insect visits, cross-pollination between flowers of 
the same or of distinct plants may readily occur. Incase i 
sects fail, spontaneous self-pollination may take place by the 
anthers coming in contact with the stigmas. 
Although the flowers are very inconspicuous, they are ate 
ive to numerous small insects, mainly Halictus, on accoun 
their easily accessible nectar. 
I have found the plant in bloom from July rst to Oc 
On three days, July 16th, and Aug. 1ith and 21st, 
lowing list of visitors was observed: 
t. 12th. 
the fol- 
meters high, and are commonly collected in clumps, d 
bloonring time are fairly white with the large pee 
cymes. The flowers expand 4 or 5 mm. They 4F 
5QOn this plant see Meehan; Torrey Bulletin, XIV, 218. 
