LEGUMINOS.E 439 



Nos. 3-6. Linear acute or acuminate, five-nerved, convolute at 

 first and rolled round the growing point, gradually becoming nearly 

 or quite flat. 



Lathyrus articulatus, L. 



Primary root very similar to that of L. Nissolia. 



Hypocotyl undeveloped or scarcely elongated. 



Cotyledons rotund-obovate, very similar to those of L. Nis- 



Stem herbaceous, annual, erect, ultimately climbing by means 

 of its leaves, tetragonous at the base and narrowly winged upwards 

 as in L. Nissolia, glabrous, pale glaucous-green ; 1st internode 9 - 5 

 mm. long ; 2nd 1-35 cm. ; 3rd 2-9 cm. ; 4th 3'12 cm. ; 5th 4-5 cm. ; 

 the rest gradually longer. 



Leaves very like those of L. Nissolia, glaucous, linear, acute, or 

 afterwards acuminate and finally cirrhous at the apex, seven-nerved 

 longitudinally (three strong and four intermediate nerves), slightly 

 scabrous at the margin ; stipules adnate to the sides of the leaves for 

 some little distance above their insertion, with slender, subulate, free 

 points, becoming triangular on the leaves a short way up the stem, 

 and finally wholly adnate, obsolete, or inconspicuous. 



No. 1. Subulate, acute, carinate, concave above, inconspicuously 

 five-nerved. 



No. 2. Ditto, but a little larger. 



No. 3. Linear, acute, five-nerved. 



No. 4. Linear, acuminate, trinerved with four intermediate, 

 inconspicuous ones. 



No. 5. Linear, produced at the apex into a short, simple cirrhus. 

 Sometimes the 6th is the first to attain this stage, which represents 

 apparently the ultimate form of the leaf. 



Lathyrus Aphaca, L. (fig. 285). 



Primary root long, tapering, fleshy, with numerous fleshy or 

 succulent tubercles, and long lateral rootlets. 



Hypocotyl undeveloped. 



Cotyledons subterranean, fleshy, persistent, plano-convex or 

 almost hemispherical, very unequal-sided by the petioles being 

 attached to one corner, mostly vertical during and after germination, 

 rarely horizontal, yellowish-white, afterwards more yellow and 

 wrinkled ; lamina truncate, 4 mm. long, 4'5 mm. wide ; petioles 

 very short, developed equally when the cotyledons are vertical, but 

 when these are horizontal one petiole becomes longer than the other 

 to allow the upper cotyledon to assume this position. There are 



