--Highly
self-fertile.
Verbascum thapsus (Scrophulariaceae).--Highly self-fertile.
Verbascum lychnitis.--Highly self-fertile.
Vandellia nummularifolia (Scrophulariaceae).--Perfect flowers produce a
good many capsules.
Bartsia odontites (Scrophulariaceae).--Covered-up plants produced a good
many seeds; but several of these were shrivelled, nor were they so
numerous as those produced by unprotected plants, which were incessantly
visited by hive and humble-bees.
Specularia speculum (Lobeliaceae).--Covered plants produced almost as
many capsules as the uncovered.
Lactuca sativa (Compositae).--Covered plants produced some seeds, but
the summer was wet and unfavourable.
Galium aparine (Rubiaceae).--Covered plants produced quite as many seeds
as the uncovered.
Apium petroselinum (Umbelliferae).--Covered plants apparently were as
productive as the uncovered.
Zea mays (Gramineae).--A single plant in the greenhouse produced a good
many grains.
Canna warscewiczi (Marantaceae).--Highly self-fertile.
Orchidaceae.--In Europe Ophrys apifera is as regularly self-fertilised
as is any cleistogene flower. In the United States, South Africa, and
Australia there are a few species which are perfectly self-fertile.
These several cases are given in the second edition of my work on the
Fertilisation of Orchids.
Allium cepa (blood red var.) (Liliaceae).--Four flower-heads were
covered with a net, and they produced somewhat fewer and smaller
capsules than those on the uncovered heads.
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