C. Robertson

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Phenology of Entomophilous Flowers

C. Robertson, 1924 .

The Philosophy of Flower Seasons, and the Phaenological Relations of the Entomophilous Flora and the Anthophilous Insect Fauna

C. Robertson, 1895, The American Naturalist.

Flowers and Insects. XXIII

C. Robertson, 1924, Botanical Gazette.

Flowers and Insects. XXII

C. Robertson, 1923, Botanical Gazette.

Flowers and Insects. I

C. Robertson, 1889, Botanical Gazette.

Flowers and insects; lists of visitors of four hundred and fifty-three flowers, by Charles Robertson.

Charles Robertson, C. Robertson, 1928 .

Descriptions of New Species of North American Bees

C. Robertson, 1891 .

Revised List of Oligolectic Bees

C. Robertson, 1926 .

SOME NEW OR LITTLE-KNOWN BEES—II

C. Robertson, 1902, The Canadian Entomologist.

Habits of the Hibiscus Bee, Emphor bombiformis

C. Robertson, 1925 .

SOME NEW DIPTERA

C. Robertson, 1901 .

Flowers and Insects. V

C. Robertson, 1890, Botanical Gazette.

Flowers and Insects. XIII

C. Robertson, 1895, Botanical Gazette.

Wing Veins of Bees as Strengthening Elements

C. Robertson, 1926 .

Flowers and Insects. XIV

C. Robertson, 1895, Botanical Gazette.

Flowers and Insects. X

C. Robertson, 1893, Botanical Gazette.

Flowers and Insects. VI

C. Robertson, 1891, Botanical Gazette.

SYNOPSIS OF ANTHOPHILA

C. Robertson, 1904, The Canadian Entomologist.

Notes on the Mode of Pollination of Asclepias

C. Robertson, 1886, Botanical Gazette.

Flowers and Insects. VIII

C. Robertson, 1892, Botanical Gazette.

Flowers and Insects: XXV

C. Robertson, 1928 .

Phenology of Oligolectic Bees and Favorite Flowers

C. Robertson, 1929 .

Flower Visits of Insects

C. Robertson, 1923 .

Flowers and Insects: XXIV

C. Robertson, 1927 .