CERTAIN SPECIES OF ASCLEPIADEX. 55 
8 x 5=40 fissures, 
16 with masses inserted, 
24 unfertilized. 
As I have collected seed of this and other Asclepiads, I hope 
next year to supply the Society with some statistics more satis- 
factory than those inserted in this paper. 
Pachycarpus. 
This plant, which is almost as abundant on my farm as the 
last, produces many and larger flowers, but very seldom fruit, 
and then generally only one follicle on a plant. The corolla is 
brown, and widely open. The folioles are horizontal and ex- 
panded, as in the genus generally, and contain a good deal of 
nectar in the furrows. The stigma does not project as in the 
last species. The ale of the anthers project outwards, are widely 
open, and acute at the base, where they turn slightly upwards. 
The pairs of pollinia are widely expanded and the masses oblong. 
The stigmatic gland is large and channelled, very narrow in the 
centre, and broadly open at the apex and base. The arms are 
curved downwards, and outwards, upwards, and downwards, at 
their junction with the masses. Where they join the gland there 
are two small expansions of membrane, and the arms themselves are 
slightly edged with membrane. On removal the arms and masses 
are never inflexed, but remain as rigid as when in the anthers. 
I have only very seldom found masses inserted in the fissures, 
although I have examined many plants on different occasions. 
Periglossum. 
The flowers of this plant are arranged in dense umbels, and 
are greenish and very inconspicuous. The plant itself has much 
the aspect of a Carex, and grows among rank herbage by the 
banks of streams. The corolla is not very widely open. The 
folioles adhere closely to the stigma, are broad above, and rounded, 
somewhat like a half moon, with the horns bent downwards like 
hooks. 
Below the half-moon expansion the foliole is much contracted. 
The pollen-masses are remarkable for the minute size of their 
glands and the length of their arms. The arms are bent down- 
wards, outwards, upwards, and downwards from the junction with 
their gland to the pollen-masses. The pollen-mass itself is very 
small compared with the length of the arms. The arms are 
