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• Catalogue of the Lepidoptera Phalænæ in the British museum
• Chinese herpetological research
• Comprehensive index to the Flora of Guatemala
• Contributions of the American Entomological Institute
• Contributions to the flora of South America: Studies on Andean Compositae, I. Studies in South American plants, II
• Contributions to the flora of South America: Studies on Andean Compositae, II. Studies in South American plants, III
• Contributions to the flora of Venezuela
• Contributions to the flora of Venezuela
• Contributions to the flora of Venezuela : from Droseraceae through Umbelliferae
• Contributions to the flora of Venezuela : from Ericaceae through Compositae
• Correspondenz-blatt des Entomologischen Vereins "Iris" zu Dresden
• Cryptogamie. Bryologie, lichenologie
• Cryptogamie. Mycologie
• Curtis's botanical magazine