234 BOTANICAL GAZETTE [an 
bear numerous flat or convex cymes of white flowers, Th 
cymes expand from 4 to 5™. 
The four petals are horizontally expanded to the extent of 
about 1. The stigma rises to about the level of the anthes 
Nectar is secreted by a yellow epigynous disk and is completely 
~ exposed. 
The flowers are homogamous. Spontaneous self-pollination 
is usually prevented by the stamens being strongly divergent 
Insects crawl about over the clusters and become thoroughly 
dusted with pollen. Pollination occurs between separate flowers — 
of the same or distinct plants. 
C. paniculata having completely exposed nectar is adapted 
to a more miscellaneous set of insects than C. florida, which has 
nectar more concealed. Nevertheless, the [ist of visitors of the 
former differs from that of the latter mainly in showing mor 
insects of the same kind, it being a larger list. The list of C- 
paniculata shows twenty-one species of lower Aculeata and Tach- : 
inidae, only three of which are flying when C. florida is im oe 
The blooming season is May 12-June 13. The following 
list was observed on May 12, 18, 23, 29, and June 8: 
Hymenoptera— Apidae: (1) Apis mellifica L. %, 8. & © P» pes 
Bombus americanorum F. 9, c. p.; (3) Synhalonia frater Cr. ga gee 
Ceratina dupla Say ¢, s. & c. p.; Andrenidae: (5) Halictus pe oe freq 
8. & c. p.; (6) H. pilosus Sm. ¢, s.; (7) H. confusus Sm. 9s. &% a 
(8) H. tegularis Rob, 9, 8. freq.; (g) H. stultus Cr. 2, s. & ¢ P-+ (10) (13) 
Stemon radiatus Say 9, s. & c. p.; (11) A. viridulus F. ®, s. & mee 
Augochlora confusa Rob. 9, s. & c. p.; (13) A. similis Rob. % 8; yes 4&3 
vicina Sm. 9, s.; (15) A sayi Rob. 9, s. & c. p.; (16) . a : 
(17) A. platyparia Rob. ¢ 9, s. & c. p., ab.; (18) A. cresson! 
P-; (19) A. rugosa Rob. 9, s. & c. p.; (20) A. forbesii pes Prosops 
hippotes Rob. 9, s. : (22) A. claytoniae Rob. 2, s. & C. P» pyr 
Pygmaea Cr. 3, s.; (24) P. modesta Say ¢ 9, S; (25) P a ng L: 
Eumenidae: (26) Eumenes fraternus Say; (27) Monobia uf ‘eae : 
Odynerus sp.; (29) O. campestris Sauss.; (30) O. unifasciatus Lep., {1¢9 
0. foraminatus Sauss.; Crabronidae: (32) Crabro eve” (35) Pee 
(33) C. errans Fox ; (34) Oxybelus emarginatus Say; Bae” cae 
poeus cementarius Dru. : (36) Chalybion caeruleum Le; on ik Se 
Ceropales fulvipes Cr.; Chalcididae - (38) Smicra torvina Ce~ © 
= =; 
“(ae 
