POLEMONIACE^E 245 



interior of the seed ; cotyledons flat, rotund-cordate in the early state, 

 ultimately ovate-cordate, obtuse, entire, alternately penninerved, 

 colourless, but large, green and foliaceous after germination ; radicle 

 short, cylindrical, somewhat pointed. 



Seedling. 



Primary root normal, long, tapering, with lateral rootlets. 



Hypocotyl becoming woody, erect, terete, glabrous, suffused with 

 purple, 8 cm. long, 2 mm. thick, giving off adventitious roots from 

 its base. 



Cotyledons shortly petiolate, large, ovate, obtuse, entire, penni- 

 nerved, convex above and green suffused with purple, concave beneath, 

 with prominent midrib and primary nerves, 6 cm. long, 3'5 cm. 

 wide ; petiole channelled above, 4 mm. long, 3 mm. wide. 



Stem erect, terete, and having two decurrent lines on each side, 

 running down from the base of the petioles, purplish, sparsely 

 pubescent with short white or crystalline hairs, flexuose at the nodes ; 

 1st internode undeveloped ; 2nd 7'2 cm. long, 1-5 mm. thick ; 3rd 

 5 mm. ; 4th 3'5 mm. or longer. Stem ultimately climbing by ten- 

 drils consisting of modified leaflets. 



Leaves cauline, lower pair opposite, the rest alternate, exstipulate, 

 petiolate, pinnately compound. 



Nos. I and 2. Opposite, imparipinnate, consisting of three pairs 

 of leaflets and a terminal one ; leaflets half folded up face to face, 

 oblong-lanceolate, acute, entire, subrevolute at the margins and 

 convex above, unequal at the base, petiolate, with a prominent sunk 

 midrib and primary lateral nerves, closely reticulate, sparsely pub- 

 escent on the upper surface ; primary midrib channelled above, 

 sparsely pubescent ; petiolules subterete, tapering upwards from a 

 stout base, pubescent, channelled above, 1*6 cm. long. 



Nos. 3 and 4. Nearly opposite, sessile, pinnate and terminating 

 in a tendril instead of a leaflet, otherwise similar to Nos. 1 and 2 ; 

 tendril at first straight, alternately branched, slightly scabrous, 

 purple, tapering towards the tip ; branches slender, dichotomous, 

 the ultimate branchlets hooked or clawed. 



When the slender tip and branchlets have grappled or coiled round 

 an object, an impulse is communicated to the lower unbranched part, 

 causing it to coil up spirally and draw the plant to the supporting 

 object. 



