468 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



Eqiiisetum hiemale var. pumiliim A. A. Eaton, Fern. Bull. 11: 



109. 1903. 

 Eqiiisetum hiemale var. affine (Engelm.) A. A. Eaton, Fern. 



Bull. 11: III. 1903. 

 Differs from the species in its longer sheaths which are 1/3-2 

 times as long as broad, and in the teeth, which are caducous. 

 Where this variety and the species overlap they intergrade and 

 pass insensibly one into the other, indicating that there is but one 

 species, although the extremes seem distinct enough. 

 Keweenaw Peninsula, 'W\c\\.,Farwell 20Q, May 30, 1885. Palmer 

 Park, Mich., Farwell 2oga, July 15, 1902. Rochester, Mich., 

 Farwell 36Q4 and jdgj, June 28, 1914; 3923, 3926, October 25, 

 1914; 3929y2, October 29, 1914. Parkedale Farm, Mich., 

 Farwell 392214, October 25, igi^; 3984}^, June 20, 1915. From 

 the Atlantic to the Pacific but most common east of the Missis- 

 sippi River. 



HiPPOCHAETE PREALTA var. Suksdorfi (A. A. Eaton) comb. nov. 



Eqiiisetum hiemale vaf. Suksdorfi A. A. Eaton, Fern. Bull. 11: 

 no. 1903. 



Somewhat similar to the variety affinis but has whorled branches 

 from the upper nodes, which are spike-bearing simultaneously 

 with the central stem; Mr. Eaton described it as with the anatomy 

 of E. hiemale but material distributed by him shows the green 

 parenchyma cut by the vallecular bast which, with the branching 

 habit, indicates a tendency toward H. laevigata, while the rosulae 

 in the groove show a trend toward H. hyemalis var. californica. 

 Collected by \\'. N. Suksdorf, September 3, 1902, at Bingen, 

 Washington. 



HiPPOCHAETE PREALTA var. intermedia (A. A. Eaton) n. comb. 



Eqiiisetum hiemale var. intermedium A. A. Eaton, Fern. Bull. 

 10: 120. 1902, \)\)., and in Gray's New Manual, 53. 1908. 



The sheaths are ampliated but not campanulate, and the teeth 

 are caducous. Described by Mr. Eaton as with the anatomy of 

 Equisetum hiemale but material distributed by him shows a variable 

 anatomy, sometimes that of //. prealta sometimes that of H. 

 laevigata. Collected at Port Huron, Michigan, by Mr. C. K. 

 Dodge. It has been found in various localities from the Atlantic 

 to the Pacific and may be looked for whene\er H. laevigata and 

 H. prealta var. ajjinis may be found in close association. 



