A contribution to our knowledge of seedlings / by the Right Hon. Sir John Lubbock.

  • Lubbock John, Sir, 1834-1913.
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: A contribution to our knowledge of seedlings / by the Right Hon. Sir John Lubbock. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    Cotyledons and radicle arranged as in H. pilosa. Primary root annual, tapering, but little branched. Hypocotyl erect, terete, pubescent, 2-2-5 cm. long. Cotyledons linear, acute, subterete, distinctly channelled along the whole upper surface, very thinly pilose or pubescent, sessile, slightly narrowed to the base, 2-3-8 cm. long, deciduous, becoming disarticulated from the stem. Stem annual, erect, terete, pubescent; 1st internode 9-10 mm. long. Leaves simple, cauline, alternate (1st pan- almost opposite), exstipulate, petiolate, thinly pubescent, finely divided or cut, with linear subterete acute segments, all chan- nelled on the upper surface ; petiole semi- terete, channelled above, articulated with the stem. Nos. 1 and 2. Almost opposite, pinnati- sect, with one or two alternate segments on each side. Succeeding leaves with more numerous, opposite or alternate segments. Plant running to seed very rapidly, even in the seedling pots before being planted out. Heliophila amplexicaulis, L. (fig, 167). Primary root long, tapering downwards, with short lateral rootlets. Hypocotyl glabrous, purple, dotted with green, 8-10 mm. long. Cotyledons]ine&v obtuse, entire, tapering insensibly into the petiole, glabrous, erect or ascending, green or more or less tinged with purple ; a midrib is present, but no other venation is discernible; 2-2-5 cm. long, 1-1-5 mm. wide. Stem erect, terete, glabrous, green or becommg purple and dotted with green annnpl • l=f ;v,f 5-10 mm. long, 2nd 6-13 mm. ' ^^^^^o-Je Leaves opposite (at least on the lower nart nf flno f clmg slender nerves, proceeding from the midrib al a acut angle mourved, and uniting with one another at their apieeriuk ! number run close to the apex of the leaf, a.d curvmg h a dl'^t Fig. Ut.—Heliophila amplexicaulis. Nat. size.
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