--Some individuals quite sterile.
Reseda lutea.--Some individuals produce very few and poor capsules.
Abutilon darwinii (Malvaceae).--Quite sterile in Brazil: see previous
discussion on self-sterile plants.
Nymphaea (Nymphaeaceae).--Professor Caspary informs me that some of the
species are quite sterile if insects are excluded.
Euryale amazonica (Nymphaeaceae).--Mr. J. Smith, of Kew, informs me that
capsules from flowers left to themselves, and probably not visited by
insects, contained from eight to fifteen seeds; those from flowers
artificially fertilised with pollen from other flowers on the same plant
contained from fifteen to thirty seeds; and that two flowers fertilised
with pollen brought from another plant at Chatsworth contained
respectively sixty and seventy-five seeds. I have given these statements
because Professor Caspary advances this plant as a case opposed to the
doctrine of the necessity or advantage of cross-fertilisation: see
Sitzungsberichte der Phys.-okon. Gesell.zu Konigsberg, B.6 page 20.)
Delphinium consolida (Ranunculaceae).--Produces many capsules, but these
contain only about half the number of seeds compared with capsules from
flowers naturally fertilised by bees.
Eschscholtzia californica (Papaveraceae).--Brazilian plants quite
sterile: English plants produce a few capsules.
Papaver vagum (Papaveraceae).--In the early part of the summer produced
very few capsules, and these contained very few seeds.
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