ROSACES 487 



Cotyledons hairy ; lamina broadly oblong, obtuse, 8 mm. long, 

 6 mm. broad ; petioles thin, grooved, dilated and connate at the base. 



Stem herbaceous and always short, ultimately developing a flower- 

 stem. 



Leaves radical, hairy all over ; petioles channelled above, 

 semiterete ; stipules mostly adnate to the petiole. 



No. 1. Triangular, obtuse, crenate-serrate. 



No. 2. Rem'form, crenate-dentate, three- to five-nerved. 



No. 3. Rotund-cordate, palmately five-nerved, crenate-dentate. 



No. 4. Cordate, obtuse, crenate-dentate, palmately five-nerved, 

 faintly lobulate, with a small isolated lobe on the petiole. 



No. 5. Lyrate-pinnatifid ; terminal lobe cordate, obtuse, lobulate ; 

 lateral segments small, irregular in size and shape. 



Ultimate leaves lyrate-pinnatifid. 



Potentilla reptans, L. (fig. 314). 



Hypocotyl mostly subterranean, tapering into the root, short. 



Cotyledons rotund, glabrous ; 3 mm. in length and breadth ; 

 petiole channelled above, 2 - 25 mm. long. 



Stem never developing, but throwing out long axillary branches 

 or runners, bearing rosettes of leaves at definite points which re- 

 produce the plant vegetatively. 



Leaves compound, digitate (first two small, simple), radical and 

 cauline, hairy on both sides ; leaflets with alternate, ascending nerves 

 running into the teeth ; petioles subterete, channelled above, dilated 

 at the base, hairy, reddish at the base and green upwards ; stipules 

 adnate to the petiole for two-thirds their length, reddish, hairy with 

 ovate, acuminate free points. 



No. 1. Simple, reniform, three- to five-nerved, toothed. 



No. 2. Rotund-rem'form, subtruncate at the base, three- to five- 

 nerved, deeply toothed. 



Nos. 3-G. Digitately trifoliolate ; terminal leaflet cuneate, bluntly 

 and rather deeply toothed on the upper half ; lateral leaflets obliquely 

 cuneate, and toothed like the terminal or subbifid, with two strong 

 nerves foreshadowing further division on the posterior or basal 

 side. 



Ultimate leaves digitately or subpedately five-foliolate, hairy 

 on both surfaces as well as the petioles, very variable in their size 

 according to the conditions of cultivation ; leaflets oblanceolate, 

 serrate, or in vigorous specimens oblanceolate-oblong, coarsely incise- 

 serrate ; basal pair obtained by fission from the middle pair, to the 

 petiolules of which they remain attached ; stipules attached to the 

 petiole for half their length, with subulate, acuminate, free points. 



