272 The Botanical Gazette. 
sence of insects, spontaneous self-pollination may ! 
occur. 
The flowers are adapted to small bees. June roth! 
served the following visitors: | 
Hymenoptera—A pide: (1) Alcidamea producta Cr. 3%, 
freq.; (2) Osmia conjuncta Cr. (=4-dentata Cr. 4) % i! 
Calliopsis parvus Rob. 9, s. and c. p.; Andrenide@: @) ¢ 
postemon radiatus Say 9, s.; (5) Augochlora pura 
and c. p., freq.; (6) Halictus pectoralis Sm. 2 a ; 
' freq.; (7) H. tegularis Rob. 9, s. and c. p.; @) aaa 
Cr. 2, c. p.; (9) Prosopis affinis Sm..9, s., freq.; &# 
10) Odynerus sp., s., freq. ; r 
Diptera—Syrphide: (11) Mesograpta pre rte 
freq. ; Tachinide : (12) Hyalomyia purpurascens je se 
OXALIS VIOLACEA L.*—The scapes rise one Gee 
into a tube about 5™" long, very wide in the th 
structed by the ten stamens and five styles. coor o 
is whitish, with greenish streaks proceeding be ding ingit : 
base. The calyx is about 4" long and is erect, ‘ 
ing firmness to the tube. In the long-s ae 
neous self-pollination is impossible, but in hoi 
form it may occur by the pollen falling ae 4 
The plant is common and blooms meme | 
roth. It is very abundantly visited by Dee* a 
*See Trelease: The Heterogony of Oxalis violaces. ail st L 
American Geraniaceez, Mem. Bost. Soc. Nat. Hist. 1: oe 
Science, v; Bot. Gaz. xm; Christy: Journ. of Bot. XXIII. 
