CCXXVOLVULACE^E 287 



Embryo straight in the early stages and lying in a truncate, 

 hollow invagination of the micropyle, becoming curved at an early 

 period, after the cotyledons project beyond the hollow process, then 

 becoming concave on the side towards the axis of the ovary ; as 

 growth proceeds it reaches the apex of the seed and then becomes 

 sharply doubled transversely over the end of the supporting process 

 where there is no resistance. After this it extends to the inner 

 angle of the seed with its edges on each side of the slightly pro- 

 minent invagination of the tegrnen. The cotyledons become trans- 

 versely oval and slightly emarginate at a very early age, a shape 

 which they retain to the last, and are deep green from the time 

 they become visible till mature, when they become pale yellow ; 

 radicle in the mature embryo at right angles to the midrib of the 

 cotyledons. 



Convolvulus tricolor, L., var. robustus unicaulis. 



Primary root long, flexuose, with numerous lateral rootlets, 

 annual. 



Hypocotyl erect, terete, thickened under the cotyledons, glabrous, 

 a deep blood-purple. 



Cotyledons obcordate, suddenly tapering at the base, trinerved, 

 subcoriaceous, glabrous except the petiole, which is channelled above 

 and slightly pubescent on the margins of the channels, and dull 

 blood-purple; lamina green, 1-45 cm. long, 1-55 cm. wide; petiole 

 1-5 cm. long. 



Stem herbaceous, annual, erect, terete, pubescent, deep blood- 

 purple at the base and green upwards ; 1st internode 6 mm. long ; 

 2nd undeveloped; 3rd G'5 mm.; 4th 4-5 mm,; 5th 9 mm. ; 6th 

 7-5 mm. ; 7th 9 mm. ; 8th 9 mm. 



Leaves simple, entire, cauline, alternate (first two opposite or 

 subopposite), exstipulate, sessile, sparsely villous when young, ulti- 

 mately glabrous or minutely pubescent, with a median nerve and a 

 few lateral, alternate, ascending nerves. 



Nos. 1 and 2. Opposite or subopposite, spathulate, rounded at 

 the end and tapered to a long, narrow, petiole-like base. 



Nos. 3-5. Spathulate, obtuse, narrowed to the base. 



No. 6. Linear-oblong, cuspidate, not much narrowed to the 

 base. 



No. 7. Oblong, acuminate, acute, with a broad base. 



No. 8. Oblong, cuspidate, broadest about the middle. 



Nos. 9 and 10. Broadly oblong, obtuse, apiculate, broad and 

 subcordate at the base. 



Nos. 11-14 inclusive. Oblong, acute, rounded at the base. 



