WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 27 
13. POLYPODIUM L. Potyropy. 
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 veins 
midway between the margin and midrib. 
1. Polypodium hesperium Maxon, Proc. Biol. Soc. Washington 18: 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........----2s+eeeeeceeeeeeeees 2. MARSILEACEAE (p. 27). 
Minute floating plants with closely imbricated, lobed 
fronds,.....--...--22.--- eee eee eee eee eee 8. 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. 8. 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: pl. 159. 1831. 
Type Locauity: ‘Ad flumenColumbiam, ora occidentali Americae Septentrionalis.”’ 
Rance: 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 Lam. 
Small floating plants with a more or less elongated and sometimes branching axis 
bearing leaves; sporocarps soft, thin-walled, two or more on a stalk, 1-celled; mega- 
sporangia containing 1 megaspore, the microsporangia bearing numerous microspores. 
1. Azolla caroliniana Willd. Sp. Pl. 5: 541. 1810. 
Typrre Locauity: ‘ Habitat in aquis Carolinae.”’ 
Rance: New York to Florida, west to California and Oregon, 
New Mexico: Animas Creek (Metcalfe 1110). Floating in still water. 
