30 MEMOIES FEOM THE DEPAKTMfiNT OF SOTANY OF COLUMBIA UiSflVEESITY 



§ i6. RUBRICAULES. 



Plants more or less cespitose, with ascending or decumbent (rarely erect), short, few- 

 leaved or subscapose stems. Leaves pinnate with 2 (seldom 3) pairs of approximate leaf- 

 lets, more or less tomentose beneath. Petals yellow, obcordate. Style long and slender, 

 filiform. 



In general habit the group much resembles the smaller members of Multifidae, but 

 differs by the long slender styles. It connects through the first species with Leucophyllae, 

 through the third with Subjugae and though the last one with Multijugae and Niveae. (P. 

 condnna divisa may be sought here.) 



Leaves densely silky on both sides. 



Pubescence white ; stem erect or ascending. 



Leaves with 2 or 3 pairs of leaflets ; bractlets much shorter than the 



sepals. 81. P. filioauUs. 



Leaves with 3-5 pairs of leaflets ; bractlets little if any shorter than the 

 sepals. 

 Pubescence yellowish ; stem decumbent. 

 Leaves mostly greenish above. 

 Sepals lanceolate or linear. 



Stem ascending or prostrate ; segments of the leaves narrowly oblong. 

 Stem ascending, slender; segments of the leaves oval to orbicular. 

 Stem nearly erect, slender ; segments of the leaves linear. 

 Sepals broadly ovate-triangular. 



Plant densely cespitose. 87. P. saximontana. 



Plant with spreading branches. [-24. P. concinna divisa.] 



§ 17. BREVIFOLIAE. 



Low alpine plants Avith a perennial short rootstock and few-leaved erect or ascending 

 stems, seldom much over 1 dm. high. Leafiets pinnate with 1-2 pairs of leaflets, nearly 

 glabrous. Petals obcordate, yellow, exceeding the sepals. Apex of the achene slightly 

 incurved, with the long slender filiform style inserted below the tip. 



The group consists of two species, of which the first is somewhat related to the 

 Multijugae, while the second is near P. fiahellifolia of the Frigidae. 



Leaves pinnate with 2 pairs of leaflets. 00 n 1 .,. ,. 



o». Jr. bremjolia. 



Leaves pinnately 3-foliolate. on r, ^ 



^ ■' 89. P. Grayi. 



§ 18. MULTIJUGAE. 

 Perennials with a very short rootstock and a deep root. Stem erect, ascending or 

 prostrate, generally less than 3 dm. high. Leaves sparingly hirsute or strigose, not to- 



