RECORD: Darwin, C. R. & Francis Darwin. 1874.10.16. Roridula dentata C.G.H dry from Kew. CUL-DAR57.135-136. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2023. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).


[135]

Oct 16 74 Roridula dentata C. G. H dry from Kew— plant apparently some feet in height with woody stem & branches. Leaves much divided, the longer ones sending out shoot opposite divisions; flattened linear with slight medial projection on upper side & strong m. projection on lower side. Both surfaces covered with glands of very unequal sizes, some very minute, & many numerous crowded unicellular pointed hairs. Glands oblong, rather truncated on summit, apparently of usual structure. Pedicels multicellular of very unequal

[135v]

I can see no signs of inflection of tentacles.

Some division of leaf— bearing only one tendril tentacle & 2 sides of tentacles; a little abortion abortion wd here lead to 2 points on on the 2 sides of a single the pedicel of tentacles

The theoretical view of divided leaf of course Drosera fully explained & rudiments on back of footstalk —

This is more primordial form than even Drosophyllum.

[136]

lengths; those towards the tips very long as in drosph. It is remarkable I can see no spiral vessels except about half way up the terminal one pedicel of leaf, & here the pedicel cannot be distinguished from the termination of leaf. Numerous fragments of insects on all parts. Leaves dark coloured when dry. Many of the pedicels on both sides of the divided leaves long. Divisions of leaves produced into fine points.

The longer leaves generally have very short & single divisions nearly opposite each other — but many of the divisions arise from the same point, & this expla such points being converted into a disc almost from structure of Drosera, with the little

[136]

one to back of leaves & on side of tentacles—these latter repeating often a whole large division of a leaf

The glands are aboriginally flattened all over leaf— but are have been retained on the summits alone of the ped pedicels.

No footstalk or petiole aboriginally

Spiral vessels less reduced than whole division, hence they run up to glands — no relation at point between gland & pedicels.


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 18 May, 2023