466 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



HiPPOCHAETE HYEMALis var. alaskana (A. A. Eaton) comb. nov. 



Eqiiisetum variegatuni var, alaskanum A. A. Eaton, Fern Bull. 

 12:39. 1904- 



Somewhat similar to the last variety but larger, yet with a 

 relatively smaller centrum, awns deciduous, and anatomy much 

 like that of H. variegata. The cylindrical, tight sheaths place it 

 here rather than with the species just named. In dried plants the 

 sheaths are liable to be slightly ampliated. Washington to 

 Alaska. 



Hippochaete variegata (Schleich.) comb. nov. 



Eqiiisetum variegatuni Schleich. Cat. Helvet. 2"]. 1807. 



This species, in its typical form, is common on sandy or gravelly 

 shores on the Keweenaw Peninsula, a tongue of land 60 miles in 

 length, stretching northeasterly into Lake Superior. It is associ- 

 ated with H. laevigata and Eqiiisetum limosum. I have seen no 

 indications that either this or the variety anceps is injured by 

 frost in this state and they are certainly evergreen. 

 Keweenaw Peninsula, Alich., Farwell 211, May 30, 1885. This 



species may be looked for north of 42°. It prefers the borders 



of cold streams and ponds. 



HiPPOCHAETE VARIEGATA var. anccps (IMIlde) comb. nov. 



Eqiiisetum variegatum var. anceps IVIilde, Ann. Mus. Lugd. Bat. 

 1:71. 1863. 



This variety is intermediate in aspect between the species and 

 H. scirpoides and approaches the latter in habit. The stems are 

 evergreen 30 cm. or less in height by i mm. or less in diameter 

 and are massed in a mat-like growth. The centrum is from obso- 

 lete to one sixth the diameter of the stem and does not exceed the 

 vallecular cavity; the anatomy is variable. The ridges and leaves 

 are 4-8, the teeth persistent, and the awns deciduous. The branches 

 have the same number of ridges and leaves as the stems or fewer 

 and in some instances they have five leaves while the stem has 

 four; the only instance, so far as I am aware, where a l)ranch 

 has more ridges and leaves than the stem from which it springs. 

 It grows on grassy borders of marl under willow thickets associ- 

 ated with moss and sedges. Parkcdale Farm. Mich., Farwell 2g2i, 

 July 28, 1912. 



