354 ON SEEDLINGS 



Cotyledons simple, unequal, orbicular, obtuse, slightly emarginate, 

 cordate at the base, the larger one slightly denticulate, the smaller 

 one nearly or quite entire ; the larger has also a raised portion in the 

 centre caused probably by the funicle, which is central, petiolate, 

 pubescent on the upper side, glabrous beneath ; midrib with numerous 

 lateral veinlets. 



Stem erect, herbaceous in the seedling stage. 



First leaves ovate, acute, simple, entire, opposite, cauline, pube- 

 scent or hairy, light green, reticulate. 



The seeds are dorsally compressed ; the cotyledons lying with 

 their faces towards the hilum, which is very conspicuous, causing a 

 deep indentation in the cotyledon, the one which is nearest the hilum 

 being considerably thicker than the other, almost twice the thickness ; 

 the seed is exalbuminous. 



Hygrophila longifolia, Nees. 



Hypocotyl erect, terete, with a few minute hairs, about 2 cm. long, 

 tinged with red. 



Cotyledons large, broadly oblong or almost triangular-rotund, 

 obtuse, minutely emarginate, petiolate, glabrous except a few hairs 

 on the petioles, dull green, alternately pinnatinerved as in the leaves, 

 but more indistinctly. 



Primary uiternodes of stem undeveloped. 



First leaves simple, entire, radical, opposite, lanceolate, obtuse, 

 ciliate, otherwise glabrous, petiolate, exstipulate, light green, dis- 

 tinctly pinnatinerved. 



Ruellia longifolia, T. Anders, (fig. 577). 



Ovary stipitate, two-celled, many-ovuled (about six to eight in a 

 cell) ; ovules erect or vertical, anatropous ; radicle inferior. 



Fruit a capsule, oblong, stipitate, dorsally compressed with a 

 lateral groove and a slightly conspicuous dorsal midrib, tipped with 

 the shortly conical persistent base of the style, glandular-pubescent, 

 obtusely subquadrangular, dehiscing loculicidally. 



Seed orbicular, laterally much compressed, lying in the hooked 

 processes of the placenta which are given off right and left alternately, 

 minutely reticulate or wavy on the flattened faces and papillose at 

 the margin ; hilum and micropyle contiguous, basal, inferior. 



Endosperm in the full grown seed just before maturity, forming 

 a thin, white layer, entirely surrounding the embryo 



Embryo straight, conforming to the interior of the seed, large, 

 colourless ; cotyledons orbicular, flat, deeply auricled at the base, 



