. 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. Lemna gibba L. Gibbous Duckweed. Fig. 1126. Lemna gibba L. Sp. PI. 970. 1753. Thallus slightly unsymmetrical, obovate or short-obovate, 14"—3" long, thickish or more or less strongly gibbous be- neath, short-stalked when young, soon separating, provided with stomata which are sparse beneath, obscurely 3-5-nerved; rootcap mostly short-pointed, rarely l
. 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. Lemna gibba L. Gibbous Duckweed. Fig. 1126. Lemna gibba L. Sp. PI. 970. 1753. Thallus slightly unsymmetrical, obovate or short-obovate, 14"—3" long, thickish or more or less strongly gibbous be- neath, short-stalked when young, soon separating, provided with stomata which are sparse beneath, obscurely 3-5-nerved; rootcap mostly short-pointed, rarely long-pointed or obtuse; fruit symmetrical, winged; seed thick, deeply and unequally ribbed. In ponds and rivers, Nebraska, Texas, Arizona and California. Also in Mexico, Europe, Asia, Africa and Australia. June-July. 3. WOLFFIA Horkel; Schleid. Linnaea, 13: 389. 1839. Thallus small, globose, ovoid-oblong, subcylindric or irregular, rootless, nerveless and leafless. The vegetative-growth is from a cleft near one end of the plant, the branch being mostly sessile and soon detached. The ovary contains one orthotropous ovule. Fruit spher- ical or short-ovate, smooth. Endosperm in a single layer. [Name in honor of Nath. Matth. v. Wolff, 1724-1784, Polish physician and naturalist.] A genus of few species, mostly in tropical and subtropical regions. Type species: Lemna hyalina Delile. Thallus globose to ellipsoid, not punctate. 1. W. columbiana. Thallus flattened above, at least on the margin, brown-punctate. Apex of thallus acute. 2. W. punctata. A large conic papule on the upper surface. 3- W. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Britton, Nathaniel Lord, 1859-1934; Brown, Addison, 1830-1913. New York, Scribner
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
