SAPIXDACE.E 



365 



in length, obtuse, somewhat constricted where the cotyledons com- 

 mence, horizontal and occupying the base of the seed, or rising 

 obliquely, or almost superior (contrary to the usual rule), and hence 

 lying on the upper side of the seed. Hence the cotyledons and 

 radicle are not always in the same vertical plane. 



Cotyledons usually vertical, that is, lying on their edges in the 

 base of the seed, incumbent, following the outline of the cavity of 

 the seed as they grow, curving round the end distant from the 

 hilum, and then growing into the cavity of the endosperm some- 

 what loosely till they touch the end next the hilum, and, growth 

 continuing, become too long for the space, and so get doubled up 

 against their own basal portion and the infolded portion of the 

 seed. Their apex then recurves and grows backwards away from 

 the hilum. 



The cotyledons still have their backs to the placenta, as in 

 A. Pseudo-Platanus, although they are in this particular instance 

 vertical to the axis of the pistil. 



Dodonsea viscosa, L. (fig. 253). 



Hypocotyl erect, terete, minutely and rather densely pubescent, 

 pale green or reddish, 1-5-8 cm. above the soil. 



Cotyledons linear-lanceolate, acute or subacute, entire, sessile, 

 or appearing shortly stalked by being narrowed at the base, with a 

 distinct midrib but no other discern- 

 ible venation, horizontal, glabrous, 

 light green above, paler beneath, 

 1-9-2-5 cm. long. 



Stem erect, terete, flexuous, densely 

 pubescent with upcurved and incurved 

 hairs, and more or less densely dotted 

 with sessile glands, pale green, becom- 

 ing reddish, ultimately woody ; 1st 

 internode 2-4 mm. long; 2nd 1-5-2 

 mm. ; 3rd 3-4'5 mm. ; 4th 4-6 mm. ; 

 5th and 6th each 5-6 mm. 



Leaves simple (at least in the 

 seedling), cauline, alternate, exstipu- 

 late, petiolate, alternately and ascend- 

 ingly penninerved, more or less pub- 

 escent on both surfaces, especially on the nerves, slightly scabrous on 

 the principal nerves, light or deep green above, paler beneath and 

 shining, often with a glaucous hue ; petiole short, stout at the 

 base and more slender upward, slightly channelled above with an 



FIG. 



3. Dodonesa viscosa. 

 Half nat. size. 



