ACANTHACE.E 



355 



FJ1 



SAIL 



FIG. 577.Euellia longifolia, x 10. A, longitudinal 

 section of seed: SAu, smaller auricle; R, radicle; 

 LAu, larger auricle ; P, endosperm ; T, testa ; FU, 

 fringe of hairs. B, transverse section of seed : C, coty- 

 ledon ; T, testa ; P, endosperm ; FH, fringe of hairs. 



three- or five-nerved, with the lateral nerves giving off two very 

 strong branches from their posterior side at the base into the 

 auricles which are 

 large, deltoid, obtuse A 



and slightly un- 

 equal, lying in the 

 broad plane of the 

 seed, and conforming 

 in outline to its 

 interior with their 

 basal edges to the 

 hooked process of 

 the placenta, and 

 their backs to the 

 axis ; radicle oblong- 

 fusiform, tapered to 

 an obtuse point and 

 projecting about one- 



third of its length or less beyond the auricles, and having its tip 

 close to the hilum and micropyle. 



Ruellia barbadensis, Benth. ct Hook. 



Hypocotyl erect, terete, glabrous, l'Q-1'5 cm. long, light green 

 or colourless. 



Cotyledons suborbicular or almost reniform, obtuse, emarginate, 

 petiolate, glabrous, light green, five-nerved, almost truncate at the 

 base ; petiole rather long, channelled on the upper side. 



Stem erect, terete, pubescent, herbaceous ; 1st internode 1-5-2 mm. 

 long. 



Dipteracanthus micranthus, Engelm. ct Gray. 



Hypocotyl erect, terete, pubescent, 3-4 mm. long, light green or 

 colourless. 



Cotyledons broadly oblong, obtuse or triangular, entire or minutely 

 emarginate, cordate at the base, petiolate with rather long petioles, 

 glabrous except on the petioles, dark green, pinnatinerved, the lower 

 nerves much longer than the others. 



Stem erect, terete, herbaceous, ultimately woody, pubescent ; 1st 

 internode 4-5 mm. long. 



First leaves simple, entire, cauline, opposite, exstipulate, oblong- 

 oval, obtuse, shortly petiolate, ciliate, pubescent, light green, alter- 

 nately pinnatinerved. 



