488 EVOLUTION OF THE EUCALYPTS, 



E. Todtiana F.v.M.(Pl.xli,, fig.l ). — Hypocotyl terete, glabrous, 

 reddish, 1-3 cm. long. Cotyledons somewhat like those of E. 

 marginata but more symmetrical, obtusely quadrilateral, slightly 

 emarginate, cuneate at base, 1 •8x1-2, petiole 0*9 cm. Petiole 

 terete, glabrous, reddish, grooved on upper side at distal ex- 

 tremity. Leaves opposite, decussate, broadly lanceolate, tapering 

 at base, coriaceous, obtuse, sessile, dark green, glabrous, lateral 

 veins oblique, parallel. 8tem terete, reddish, with a few glandular 

 hairs. First pr. of leaves 3-6 x 1 '6; second 4x1-6 cm. First 

 internode 0*6, second 0-6, third 0-5 cm. 



E. megacarpa F.v.M. (PL lii., fig.3) — Hypocotyl short, terete, 

 reddish, glabrous, 0-6 cm. long. Cotyledons resemble those of 

 E. l^odtiana, but broader, and petiole shorter and narrower. 

 They are obtusely oblong, trinerved, 1-5 x 1, petiole 0-7 cm., base 

 of lamina cuneate. Leaves entire, opposite, decussate, obtuse, 

 sessile, glabrous, broadly lanceolate, venation pinnate, open, 

 intramarginal vein ill defined. First pr. 4x1-5, second 4*5 x 1-8 

 cm. First internode 0-7, second 2-5, third 2 cm. Stem terete, 

 reddish, glabrous. 



E. santcdifolia F.v.M.(Pl.l.,fig.5) — Hypocotyl terete, glabrous, 

 0-7 cm. long. Cotyledons smaller than in E . megacarpa but of 

 same form, obtusely quadrilateral, cuneate at base, slightly 

 emarginate, 1 x 0*7, petiole 0-5 cm. Leaves opposite, decussate, 

 glabrous, sessile, ovate, obtuse, cordate at base, lateral veins 

 parallel, somewhat oblique. First pr. 2-4x1-1, second 3x1-4, 

 third 3 1 x 1-6 cm. First internode 0-4, second 0-2, third 0-6, 

 fourth 1-2 cm. Stem reddish, terete, glabrous. 



The above four species form a good group, as far as the seedlings 

 are concerned, E . marginata being most removed from the others 

 in its asymmetrical cotyledons, long petioles, and subterranean 

 hypocotyl. They all have broad, sessile leaves, which are large 

 from the very first pair. 



ii.(6). Eucalypts with cotyledons large then smaller, usually 

 obtusely quadrilateral, slightly emarginate, leaves usually sessile. 

 Undersurface of cotyledons and leaves generally tinged deep 

 purplish colour. This group comprises the " Peppermints " and 

 their near allies containing phellandrene, eucalyptol, and pinene. 



