108 The Botanical Gazette. [March, 
ref. (6) and {10).—(17) MacLeod, Untersuchungen iiber die Befruchtung 
blatt 23: 366. 1885. Z. oudgaris, autogamy. (Just’s Bot. Jahresbericht 
13?: 740.)—(18) MacLeod, Nouvelles recherches sur la fertilisation de 
: e Biol. 6. 
measurements. ull. Torr. Bot. Club 16: 135. 1889. S. danceolatum, 
(Just’s Bot. Jahresbericht 171: 523.)—(22) Kerner, Pflanzenleben. 2:—. 
1891. (Just’s Bot. Jahresbericht 17!; 528. 18: 484.) Z. ciliata Protec- 
tion of pollen by nodding of fls., 118. Z. thyrsifiora, ciliata, attraction 
1 47-48. 1893. 
folia, vulgaris, nemorum, nummularia. (Bot. Centralblatt 55: 1o1.)— 
(24) MacLeod, Over de bevruchting der bloemen in het Kempisch 
gedeelte van Vlaanderen. Bot. Jaarboek 5: 443-444. 1893. LZ. vul - 
garis, nemorum,nummularia, thyrsifiora. ‘Bot. Centralblatt 56: 177-) 
120 i 
biologische Floristik des mittleren und nédrdlichen Europa sowle 
Gronlands. 1894. LZ. vulgaris, 161. . nummularia, nemorum, thyrst- 
auf den Nordfriesischen Inseln. 
ENSLENIA ALBIDA Nutt.—The plants are common on creek- 
banks, often climbing high, and blooming from July 12th to 
August 22. The flowers are white and are arranged in small 
umbel-like clusters. The petals are erect, and their tips are 
bent aside, out of the way of the passage leading to the 
nectar. The divisions of the crown are petal-like and erect, 
the central portion being produced above into two long ap- 
pendages. On each side there is a wing-like portion which 
is grooved on the inner face, where the nectar is secreted 
and lodged. Each wing-like part, with the one of the next 
division forms a more or less well defined passage, which 
guides the bee’s proboscis to the nectar. This is situated S0 
near the angles of the wings of the approximated anthers 
that, when the proboscis is withdrawn, some slender append- 
age is quite likely to be caught between the divergent angles 
of the anther wings and guided by them into the cleft of the 
little black corpusculum which lies at the top of the slit- 
The gynostegium is quite slender and is tipped by five white 
