WOOTON AND STANDLEY FLORA OF NEW MEXICO. 27 



13. POLYPODIXJM L. Polypody. 



Rootstocks elongated; fronds 5 to 20 cm. long, once pinnatifid into linear-oblong, 

 obtuse or acute segments; sori rounded, exindusiate, borne at the ends of the veina 

 midway between the margin and midrib. 



1. Polypodium hesperium Maxon, Proc. Biol. Soc. Washington 13: 200. 1900. 



Type locality: Coyote Canyon, Lake Chelan, Washington. 



Range: British Columbia to Arizona and New Mexico. 



New Mexico: Sandia Mountains (Miss C. C. Ellis). Damp woods. 



Miss Ellis reports that this is found in crevices and under rocks near Balsam, in 

 Lagunita, and on ridges between the latter place and Las Huertas Canyon. The 

 species should occur in some of the ranges in the western part of the State. 



Order 2. SALVINIALES. 



KEY TO THE FAMILIES. 



Creeping plants with 4-parted petioled leaves of 



medium size 2. MARSILEACEAE (p. 27). 



Minute floating plants with closely imbricated, lobed 



fronds 3. SALVINIACEAE (p. 27). 



2. MARSILEACEAE. 

 1. MARSILEA L. 



Herbaceous perennials growing in muddy places, with slender creeping stems and 

 4-foliolate long-petioled leaves; sporocarps borne at the base, in ours almost sessile, 

 hard, reniform, 2-valved, several-celled, containing both kinds of spores. 



A single species so far obtained in New Mexico, but others will probably be found 

 growing about pools in the mountains. 



A specimen in the U. S. National Herbarium obtained by one of the collectors of 

 the Mexican Boundary Survey is determined as M. uncinata A. Br. The label shows 

 nothing as to place or time of collection. The published report states that Doctor 

 Bigelow obtained this species in New Mexico, without further locality. The specimen 

 referred to is very small but is probably correctly determined. 



1. Marsilea vestita Hook. & Grev. Icon. Fil. 2: pi. 159. 1831. 



Type locality: "Ad flumenColumbiam, ora occidentali AmericaeSeptentrionalis." 



Range: Arkansas and Texas to California, north to Washington and British 

 Columbia. 



New Mexico: Queen (Wooton). In mud. 



The single station at which this plant was found was near the top of the Upper 

 Sonoran Zone, but the same species was collected by Wright near San Elizario, Texas, 

 which is Lower Sonoran, while the range given by most authors suggests the Transition. 



3. SALVINIACEAE. 



1. AZOLLA Lain. 



Small floating plants with a more or less elongated and sometimes branching axis 

 bearing leaves; Bporocarpa soft, thin-walled, two or more on a stalk, l-celled; m< 

 Bporangia containing 1 megaspore, the microeporangia bearing numerous microspores. 



1. Azolla caroliniana Willd. Sp. PI. 5: 541. 1810. 

 Type locality: "Habitat in aqnis Carolinae 

 Rangk: New York to Florida, west to California and < Oregon 

 New Mexico: Animas Creek i \£etoalft 1110). Floating in still water. 



