10 OPHIOGLOSSACEAE. 



Botrychium onondagense Underw. In habit like B. lunaria; leaf-segments 

 7-9, not overlapping, broadly wedge-shaped. 



Moist meadows, Olympic Mountains. Probably only a variant of B, 

 lunaria to which it is reduced by some botanists. 



Botrychium lanceolatum (Gmel.) Angstroem. Plant 8-30 cm. high; 

 sterile portion of the leaf sessile near the top, triangular, twice pinnatifid, 

 rather thin; ultimate segments lanceolate, acute, toothed. 



In the mountains, very rare. Mount Rainier, Allen; Olympic Mountains, 

 Flett. 



Botrychium ramosum (Roth) Ascherson. Somewhat fleshy, 10-25 cm. 

 high; sterile segment of the leaf pinnate or bipinnatifid, short-petioled; ultimate 

 segments oblong to ovate-oblong, obtuse; sporophyll bipinnate or tripinnate, 

 erect on a long petiole. 



Agassiz, B. C., Macoun; Mount Adams, Stiksdorf. The American plant is 

 sometimes considered distinct from that of the Old World under the name 

 B. neglectum Wood. 



Family 3. MARSILEACEAE. 



Plant perennial, herbaceous, rooting in the mud, with slender 

 creeping rootstock and 4-foliolate or filiform leaves; sporangia 

 borne within closed receptacles (the sporocarps) which arise 

 from the rootstock near the leafstalks or are consolidated with 

 them; spores of two kinds, large ones (megaspores) and small 

 ones (micros pores'), both contained in the same sporocarp. 



18. MARSILEA. 



Marsh or aquatic plants; leaves slender petioled, quadri- 

 foliolate, commonly floating on the surface of shallow water; 

 sporocarps ovoid or bean-shaped, peduncled and rising from 

 the petiole or from the rootstock at the base of the petiole, com- 

 posed of two vertical valves having several transverse com- 

 partments (sori) in each valve; also provided inside with a ring 

 which at the opening of the valves swells and tears the sori from 

 their positions; sori composed of both megasporangia and micro- 

 sporangia. 



Marsilea vestita Hook. & Grev. Rootstock slender, creeping; leaves more 

 or less pubescent with white hairs; petioles slender, 4-12 cm. long; leaflets 

 deltoid-obovate, 4-12 mm. long, mostly entire; sporocarps solitary on the 

 stalks, 4-8 mm. long, 3-5 mm. wide, with a short raphe, a short blunt lower 

 tooth, and an acute upper one, densely pubescent with white appressed hair- 

 like scales; sori 6-11 in each valve. 



Rare in our limits. Reported as common on Menzies Island opposite 

 Fort Vancouver, Washington. 



Class II. EQUISETINEAE. 



Plants rush-like with hollow jointed stems rising from 

 subterranean rootstocks; sterile leaves reduced to scales, 



