Primulaceae.
Pringlea.
Proteaceae of Australia.
Prunus avium.
-- laurocerasus.
Pteris aquilina.
Radish.
Ranunculaceae.
Ranunculus acris.
Raphanus sativus.
Reinke, nectar-secreting glands of Prunus avium.
Reseda lutea.
measurements.
result of experiments.
self-fertile.
-- odorata.
measurements.
self-fertilised scarcely exceeded by crossed.
seeds.
want of correspondence between seeds and vigour of offspring.
result of experiments.
sterile and self-fertile.
Resedaceae.
Rheum rhaponticum.
Rhexia glandulosa.
Rhododendron, spontaneous crossing.
Rhododendron azaloides.
Rhubarb.
Ribes aureum.
Riley, Mr., pollen carried by wind.
Yucca moth.
Rodgers, Mr., secretion of nectar in Vanilla.
Rye, experiment on pollen of.
Salvia coccinea.
measurements.
early flowering of crossed.
seeds.
partially self-sterile.
-- glutinosa.
-- grahami.
-- tenori.
Sarothamnus scoparius.
measurements.
superiority of crossed seedlings.
seeds.
self-sterile.
Scabiosa atro-purpurea.
measurements.
Scarlet-runner.
Scott, J., Papaver somniferum.
sterility of Verbascum.
Oncidium and Maxillaria.
on Primula scotica and Cortusa matthioli.
Scrophulariaceae.
Self-sterile varieties, appearance of.
Self-fertilisation, mechanical structure to check.
Self-sterile plants.
wide distribution throughout the vegetable kingdom.
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