RUTACE/E 319 



for reserve-material and not to assimilate after germination. 

 They are nearly always alternate, and two, rarely three in 

 number. Murraya exotica agrees in the deciduous nature of 

 its cotyledons. 



The subterranean type may be represented by Caloden- 

 dron capense, which has very large seeds and fleshy, shortly 

 petiolate cotyledons. Those of Citrus Aurantium are much 

 smaller, opposite or frequently alternate, colourless, fleshy, 

 often compressed and of variable shape owing to the presence 

 of several embryos in the seed, and strictly subterranean. 

 In C. decumana they are oblong-elliptic, slightly falcate, 

 plano-convex, fleshy, greenish-yellow, and both directed to one 

 side of the stem as in some other cases where the cotyledons 

 are subterranean. zEgle Marmelos has similar, but smaller, 

 rounder seeds with cotyledons like those of the Pea. 



There is considerable variation in the first leaves. The 

 first one of Correa Colvillei is oval, the three succeeding ones 

 roundly-elliptic. Those of C. viridiflora are obovate ; and 

 they differ but little in the adult stage, as the leaves of all 

 the Correas are of very simple forms and quite entire. The 

 leaves of Ptelea trifoliata are digitately trifoliolate from the 

 first, or the primary leaf may be imperfect and have only two 

 leaflets. Their margins are doubly and bluntly denticulate or 

 crenulate, bearing some resemblance to those of the cotyledons, 

 but the latter differ in being merely simply crenulate with 

 distinctly rounded crenatures. The first leaf of P. aptera 

 is simple and acuminate-lanceolate, followed by one that is 

 digitately trifoliolate or imperfectly so, and that again by 

 one having four or five leaflets. The first two or three leaflets 

 of Limonia acidissima are ovate and alternate, opposite, or 

 verticillate ; the second and third digitately trifoliolate or 

 pinnate, in other individuals with five opposite elliptic leaflets, 

 and winged midribs. Murraya exotica differs in the first 

 two leaves being opposite and triangular-ovate, and in the 

 succeeding ones being pinnate with three or four alternate 

 entire leaflets. 



The first six leaves of Calodendron capense are reduced 

 to small scales, a case of frequent occurrence where the seeds 

 are large with subterranean cotyledons. Those that succeed 



