262 BOTANICAL GAZETTE. [ Oct., 
7. P. Lambertiana Doug. ‘Two to six rows of stomata on 
each face of the triangular section : always two dorsal ducts, often 
one between, occasionally some ventral ducts which are sometimes 
parenchymatous, no strengthening cells in fibro-vascular region: 
leaves 3-4 in. long. 
In the Sierra Nevada and Coast Range. 
Notes on the mode of pollination of Asclepias. 
CHARLES ROBERTSON, 
(WITH PLATE VIII ) 
In regard to the visitors of Asclepias Cornuti, Dr. Hermann 
Miiller observes that they “slip upon the smooth parts of the 
flower until a foot enters the wide inferior part of the slit, in 
_ which it at last gets a firm hold”. Mr. T. H. Corry’ describes 
the insect as grasping the back of a nectary, and plunging its » 
proboscis into its cavity, “endeavoring at the same time to get a 
firm and sure foothold on the unstable flowers ” until the insect 
at length places one of its feet into the wider part of an alar fis- 
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also found pollinia of this species on the spurs and claws of 
Danais Archippus, and high up on tarsal hairs of Priononyx 
ict reel ese i 
_ 1. Befruchtung der Blumen”, 3, p.336. T ee slated 
by D’ Arey W. Thompson, B. A., 1883, p.898. The Fertilization of Flowers ”’, tran 
a7 Structure and Development of the Gynostegiu ization 
_ inAselepias Cornuti, Dec.,” Frans. Linn. Soc. Fe ee et tee Mode of Fertil 
186, 187. ond. Bot. 2d Ser. Vol. II., part 8. 1883, PP- 
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