838 THE JOURNAL OF BOTANY 
teeth, especially in the upper parts. Section of the stigmatic 
chamber shows it to be very narrow—as usual where the pollinium 
is of fly-wing type. The pollinia are large, flattened, each mass 
tapering towards its narrow point of attachment to the retinaculum. 
Retinacula kneed and flattened at the knee in a plane at right 
angles to the flattening which obtains upon the proximal and distal 
sides of it. A curious, delicately-arched, thread-like process passes 
from the retinaculum to the pollinium. : 
Asclepias Calceolus §. Moore (966) (see p. 812).—Valves of stig- 
matic chamber salient below, receding in a curved line back to the 
column. There is an orifice at the angle. In profile the valves 
resemble a hooked nose. Pollinia flattened, of fly-wing type. 
Retinacula kneed, with well-marked warty, clasping-surface, and 
brownish. Cuculli simple and foliar. Lateral edges below have 
a thickened ridge which flanks an avenue of approach to the stig- 
matic slits, completed upon the opposite side by that of adjoining 
cucullus. The pollinia are only slightly flattened. Retinaculum 
kneed at a point close to its insertion into pollinium. The stigmatic 
slits dilate into a lenticular-shaped opening below. Stigmatie 
valves not markedly salient. A distinct slippery surface over outer 
walls of the anther-loculi. The membranous tips of the anthers 
have a crater-like ending inferiorly, over the edge of which the 
eae giving a gargoyle-like effect in profile. The valves finely 
ty) i i 
narrow in section. Pollinia flattened, of fly-wing type. Retinacula 
not kneed, but flattened and twisted upon themselves. Clasping 
surface warty. x 300; the hairs of corolla show surfaces covered 
with fine clear rod-shaped markings disposed in a left-hand spiral 
around the circumference of the hair. 
Asclepias densiflora N. B. Br. (968).—Stigmatic valves horny, 
salient below, the angle turning at about 90°. Pollinia of fly-wins 
type. Retinacula kneed, the corpuscular half being stouter than 
the pollinial half. They are twisted upon themselves through 
half-turn. Stigmatic chambers lenticular in section. This example 
is interesting in that the antherial portion of the column beimg 
one is able to trace by what may be regarded as a piece of natural 
ic é 
