“ When it grows in the open sun it often becomes contracted and compact in habit, but the typical form of the species is so unlike B. obliquum that it is more rational to consider it a distinct species. ”

“ The more slender habit, and the distant cuneate segments will readily distinguish it from B. Lunaria. The European species also occurs in British America and Alaska and in the high mountains of Colorado. The smaller species of this genus present as close a series as the much larger ternatum group and should receive more thorough field study. In this species the leaf is rarely quite short-stalked and in one or two specimens seen the number of segments is abnormally increased to fifteen. ”

“ Against these more rational estimates, the English botanists even in their latest pronouncement [3] can find only six species! The present list enumerates thirty-four species whose status is quite definitely known, and four others concerning which there are no materials for verification that have been accessible up to the present time. Besides the above there is material at Kew and Berlin representing certainly one and possibly two additional species of the ternatum group from South America, and perhaps a third from Central America. ”

“ A slender species somewhat intermediate between B. Lunaria and B. tenebrosum with distant wedge-shaped segments. Roots slender from a very short axis: common stalk slender, rather weak and spreading, 8-12 cm. long: lamina short-stalked (about 1 cm.) , 2-4 cm. long, 1-1.5 cm. wide, composed of 7-9 broadly cuneate segments which are spaced their own width or more, with one or more notches in the outer margin, or occasionally quite deeply incised: sporophyll 1.5-2.5 cm. ”

“ Jamaica: Morce's Gap, altitude 1500 m., 7 Feb. 1900. W. N. Clute, 96. (Type in herb. Underwood.)
This plant was distributed as B. Virginianum with which it had been previously confounded and which it resembles rather closely, but differs in its peculiar short panicle, in the cutting of the lamina, and especially in its persistent sterile leaf which remains fresh until the new one is fully developed, the plant thus having two growing leaves at the time of maturity to which allusion is made in the specific name. ”

“ Tent. Pterid. 43. 1845.
— Scandinavia, Siberia, Alaska, to Washington, eastward to Greenland, Labrador and Newfoundland and southward to Colorado, Michigan and Pennsylvania.
Botrychium lanuginosum Wall. Cat. 48 (nomen nudum) ;
Hook. & Grev. Ic. Fil. 1 : pl. 79. (pl. jun.) 1831. — India.
Botrychium Lunaria (L.) Sw. Schrader's Jour. Bot. 18002 : 110. 1801.
Osmunda Lunaria L. Sp. Pl. 1064. 1753.
— Europe, Northern Asia, Newfoundland, Labrador. Minnesota, Colorado, Utah, and northward to Alaska and Greenland
47 Botrychium lunarioides (Rich.) Sw. ═ B. biternatum. ”