GERANIACEAE, LEGUMINOSAE, ONAGRACEAE, ETC.
Pelargonium zonale, a cross between plants propagated by cuttings does
no good.
Tropaeolum minus.
Limnanthes douglasii.
Lupinus luteus and pilosus.
Phaseolus multiflorus and vulgaris.
Lathyrus odoratus, varieties of, never naturally intercross in England.
Pisum sativum, varieties of, rarely intercross, but a cross between them
highly beneficial.
Sarothamnus scoparius, wonderful effects of a cross.
Ononis minutissima, cleistogene flowers of.
Summary on the Leguminosae.
Clarkia elegans.
Bartonia aurea.
Passiflora gracilis.
Apium petroselinum.
Scabiosa atropurpurea.
Lactuca sativa.
Specularia speculum.
Lobelia ramosa, advantages of a cross during two generations.
Lobelia fulgens.
Nemophila insignis, great advantages of a cross.
Borago officinalis.
Nolana prostrata.
13. GERANIACEAE.--Pelargonium zonale.
This plant, as a general rule, is strongly proterandrous, and is
therefore adapted for cross-fertilisation by the aid of insects. (5/1.
Mr. J. Denny, a great raiser of new varieties of pelargoniums, after
stating that this species is proterandrous, adds 'The Florist and
Pomologist' January 1872 page 11, "there are some varieties, especially
those with petals of a pink colour, or which possess a weakly
constitution, where the pistil expands as soon as or even before the
pollen-bag bursts, and in which also the pistil is frequently short, so
when it expands it is smothered as it were by the bursting anthers;
these varieties are great seeders, each pip being fertilised by its own
pollen.
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