. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 2. Marsilea vestita Hook. & Grev. Hairy Pepperwort. Fig. 86. M. vestita Hook. & Grev. Ic. Fil. pi. 159. 1831. Marsilea mucronata A. Br. Amer. Journ. Sci. (II.) 3: 55. 1847. Rootstocks slender, creeping. Petioles slen- der, 2'-s' high; leaflets similar to those of the preceding species, entire or toothed; sporo- carps 2"-4r" long, 2"-3&quo
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 2. Marsilea vestita Hook. & Grev. Hairy Pepperwort. Fig. 86. M. vestita Hook. & Grev. Ic. Fil. pi. 159. 1831. Marsilea mucronata A. Br. Amer. Journ. Sci. (II.) 3: 55. 1847. Rootstocks slender, creeping. Petioles slen- der, 2'-s' high; leaflets similar to those of the preceding species, entire or toothed; sporo- carps 2"-4r" long, 2"-3" wide, with a short raphe, a short and blunt lower tooth and an acute and sometimes curved upper one, densely covered with soft spreading narrow hair-like scales or (in the forms known as M. mucro- nata) these short and appressed or almost wanting; sori 6-11 in each valve. In wet sand or in shallow ditches, Florida to Kansas, Arizona and Mexico, California and British Columbia. Family 7. SALVINIACEAE Reichenb. Consp. 30. 1828. Salvinia Family. Small floating plants with a more or less elongated and sometimes branching axis bearing apparently 2-ranked leaves. Sporocarps soft, thin-walled, borne 2 or more on a common stalk, i-celled, with a central often branched receptacle, which bears megasporanges containing a single megaspore or microsporanges containing numerous microspores. The megaspores germinate into prothallia which bear archegones, the microspores into prothallia which bear antherids. The family consists of two genera. Leaves 6"-g" long, 2-ranked, on mostly simple stems. Leaves minute, closely imbricated on pinnately branching stems. 1. Salvinia. 2. Azolla. i. SALVINIA Adans. Fam. PI. 2: 15. 1763. Floating annual plants with slender stems bearing rather broad 2-ranked leaves, these finely papillose on the upper surface. Sporocarps globose, depressed, 9-14-sulcate, mem- branous, arranged in clusters, I or 2 of each cluster containing 10 or more sessile mega-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
