106 The Botanical Gazette. (March, 
The bright yellow petals expand horizontally, the flower 
measuring 2 or 3™ across. 
The flower is proterogynous. The styles elongate, holding 
their receptive stigmas above the anthers, which at first art ) 
allclosed. The outerstamens lengthen and discharge first, the 
dehiscence being extrorse. 
There is abundant opportunity for cross-pollination befor 
the anthers begin to discharge. Later cross- or self-pollint 
tion may occur by insect aid. There is no doubt that sell 
pollination depends mainly upon the visits of insects. lh 
however, the stigmas remain untouched until the inner at 
thers discharge, spontaneous self-pollination may occur ly 
pollen falling upon the stigmas, since the inner filaments fit: 
ally lengthen so as to hold the dehiscent anthers over the st 
mas. The plant was observed in bloom from April 8th® 
May 24th. On six days, between April 16th and May 7th 
the following list of visitors was observed: eae 
HYMENOPTERA.—A fide: (1) Synhalonia belfragel Cr 
s.; (2) Ceratina tejonensis Cr. 2, s.; (3) C. dupla Say 6% $# 
c. p., ab.; (4) Osmia albiventris Cr. 49, s. and c. P» ab. ; | 
O. conjuncta Cr. 9, c. p.; (6) O. lignaria Say % S- and ¢ Py 
olemollt 
ek 
c. p.; (17) H. ligatus Say 9, s. and c. p.; (18) gi 
Nyl. 9, s. and c. p.; (19) H. pilosus Sm. &, s. and c. Pi 
H. obscurus Rob. 9, s. and c. p.; (21) H. stultus Cr. % Bie 
H. zephyrus Sm. 9, s.; (23) Sphecodes dichroa Sm. 6) % 
DiPTERA.—Bombylide: (24) Bombylius pulchellus a 
one; (25) B. fratellus Wd., s.; Syrphide: (26) Pipiza ee / 
- Will., f. p.; (27) P. femoralis Lw., f. p.; (28) Chilosié To 
lata Lw., s. and f. p., ab.; (29) Melanostoma 
s. and f. p.; (30) Syrphus ribesii L., s. and f. pei Wig 
americanus Wd., s. and f. p.; (32) S. arcuatus Fil, f. pi 
ay, f. p.; Tachinide: (35) Siphona illinoens® 
Muscide : (36) Cyrtoneura sp.; Anthomytd@: (37. ) Hy 
sp., s.; (38) Homalomyia sp., s; (39-49) Anthomy!® 
(41-42) Chortophila sp., s. 
