324 ON SEEDLINGS 



Hypocotyl subterranean, short, stout, curved, longitudinally 

 ridged, colourless, 2-3' 5 mm. long. 



Cotyledons two, opposite or frequently alternate, colourless, 

 fleshy, not leaving the testa, but very often compressed and shape- 

 less owing to the presence of two, three, or four embryos in the 

 seed. 



Stem woody, erect, terete (striate when dried and somewhat 

 twisted), pale green, glabrous or minutely pubescent ; 1st internode 

 2-5-4 cm. long ; 2nd, and sometimes the 3rd and 4th, undeveloped, 

 or the 3rd 3 mm. and the 4th 2-25 mm. long. 



Leaves simple, cauline, alternate, exstipulate, petiolate, evergreen, 

 shining, coriaceous, thickly dotted with immersed glands, strongly 

 odoriferous when bruised, glabrous. 



Nos. 1 and 2. Generally opposite by the non-development of the 

 internode, more or less obliquely obcordate and appearing deformed 

 very shortly petiolate. 



Nos. 3 and 4 (in specimen examined). Alternate, elliptic, obtuse, 

 obsoletely serrate, minutely emarginate, with alternate, ascending, 

 lateral nerves ; petioles channelled above, narrowly winged, articu- 

 lated with the stem below and the leaf above. 



Ultimate leaves oblong-ovate, acuminate, emarginate, minutely 

 and obsoletely serrate, pellucidly punctate, with a thin marginal 

 line of larger glands ; lamina articulated with the winged petiole, 

 which is ovate in outline, with a short, stout, not winged base. 



Citrus decnmana, L. 



Hypocotyl very short, subterranean. 



Cotyledons subterranean, and remaining in the seed till they 

 decay, oblong-elliptic, obtuse, plano-convex, fleshy, sessile and both 

 directed to one side, greenish -yellow above, yellowish beneath, 

 somewhat falcate, 13 mm. long, and 6 mm. wide. 



Stem soon becoming woody, covered with a short, very fine 

 pubescence ; 1st internode 5-5-5 cm. long ; the one to three follow- 

 ing ones suppressed, or from two to four of the leaves on the same 

 level ; succeeding ones again elongated. 



Leaves as in C. Aurantium. 



1st pair opposite, orbicular, emarginate, subsessile, not arti- 

 culated with the short petiole, crenate. 



2nd pair often on the same level as the first two, so that 

 there is a whorl of four. When distinct oblong or elliptic, obtuse, 

 otherwise like the two preceding. 



5th (where the first four are whorled) elliptic, cuneate at the 

 base. 



