26 Holm — Studies in the Cyperaceae. 



much more slender in all respects, and of a very light 

 color, as indicated by the name. 



Car ex cequa C. B. Clarke (figs. 6-8). 



The diagnosis 15 of this new species reads as follows: 

 "Bhizomate ligneo horizontali; culmis 5-6 dm. longis, 

 gracilibus ; f oliis 2%-3 m. m. latis ; spicis 3-5, sessilibus, 

 sparsis, terminali mascnla sessili; stylo trifido; utricnlis 

 (rostro inclnso) vix 3 m. m. longis, ellipsoideis, trigonis, 

 levibns glabris. 



C. fulva var. Hornschuchiana W. Boott in S. Watson's 

 Botany of California II, p. 228, 250. C. Lemmoni L. H. 

 Bail., Proceed. Am. Acad. p. 112, 1886 non Boott. 



C. Lemmoni W. Boott in Coulter's Bot, Gazette IX, 

 1884, p. 93, est planta csespitosa foliis lineari-lanceolatis. 

 California: San Mateo, Baker n. 811." — To this diag- 

 nosis may be added that the strong, horizontal rhizome 

 is stoloniferous, covered with dark reddish-brown, scale- 

 like leaves ; that the staminate spike is sometimes pedun- 

 culate, and gynsecandrous ; that the bract of the lowest 

 spike is sheathless, with the blade overtopping the male 

 spike ; that the scales of the pistillate spikes are aristate, 

 the arista scabrous ; that the spreading perigynia are 

 obscurely 6-8 veined, and terminated by a short beak, 

 which is bidentate, and finely spinulose (figs. 7-8). 



The species has, so far, only been collected in Cali- 

 fornia : San Mateo Countv, and Marin Countv, Mount 

 Tamalpais, by C. F. Baker, W. N. Suksdorf and C. V. 

 Piper. 



The affinity is with C. diluta M. Bieb. of the grex: 

 Spirostachyce. 



EXPLANATION OF FIGURES. 



Fig. 1. Inflorescence of Carex venustula Holm, natural size. Specimen 

 from Chistachina River, lat. 63, between Cook inlet and the Tanana River, 

 collected by E. F. Glenn. 



Fig. 2. Scale of staminate spike of same; enlarged. 



Fig. 3. Scale of pistillate spike of same; enlarged. 



Fig. 4. Perigynium of same; enlarged. 



Fig. 5. Same opened, showing the stipitate nut; enlarged. 



Fig. 6. Inflorescence of Carex cequa Clarke, natural size. Specimen 

 from Crystal Springs, San Mateo County, California, collected by C. F. 

 Baker. 



Fig. 7. Scale and perigynium of same; enlarged. 



Fig. 8. Perigynium, fully matured of same; enlarged. 



Fig. 9. Inflorescence of Carex Lemmoni W. Boott; natural size. Speci- 

 men from Chilliwack Valley, British Columbia, collected by J. M. Macoun. 



Fig. 10. Scale of pistillate spike of same; enlarged. 



Fig. 11. Scale and perigynium of same, side view; enlarged. 



Fig. 12. Perigynium of same, front view; enlarged. 



Clinton, Md., February, 1919. 

 15 Ibidem. 



