Cuphea purpurea (Lythraceae).--Produced no seeds. Other flowers on the
same plant artificially fertilised under the net yielded seeds.
Vinca major (Apocynaceae).--Is generally quite sterile, but sometimes
sets seeds when artificially cross-fertilised: see my notice 'Gardeners'
Chronicle' 1861 page 552.
Vinca rosea.--Behaves in the same manner as the last species:
'Gardeners' Chronicle' 1861 page 699, 736, 831.
Tabernaemontana echinata (Apocynaceae).--Quite sterile.
Petunia violacea (Solanaceae).--Quite sterile, as far as I have
observed.
Solanum tuberosum (Solanaceae).--Tinzmann says ('Gardeners' Chronicle'
1846 page 183) that some varieties are quite sterile unless fertilised
by pollen from another variety.
Primula scotica (Primulaceae).--A non-dimorphic species, which is
fertile with its own pollen, but is extremely sterile if insects are
excluded. J. Scott in 'Journal of the Linnean Society Botany' volume 8
1864 page 119.
Cortusa matthioli (Primulaceae).--Protected plants completely sterile;
artificially self-fertilised flowers perfectly fertile. J. Scott ibid.
page 84.
Cyclamen persicum (Primulaceae).--During one season several covered-up
plants did not produce a single seed.
Borago officinalis (Boraginaceae).--Protected plants produced about half
as many seeds as the unprotected.
Salvia tenori (Labiatae).--Quite sterile; but two or three flowers on
the summits of three of the spikes, which touched the net when the wind
blew, produced a few seeds.
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