. 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. 250 ROSACEAE. Vol. it. Over 300 species, nearly all of them natives of the north temperate zone. Besides the follow- ing at least 100 others occur in the western and northwestern parts of North America and several in Arctic America. Type species : Potentilla reptans L. A. Flowers solitary, axillary, long-peduncled. Flowers 4-parted ; upper leaves 3-foliolate. F
. 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. 250 ROSACEAE. Vol. it. Over 300 species, nearly all of them natives of the north temperate zone. Besides the follow- ing at least 100 others occur in the western and northwestern parts of North America and several in Arctic America. Type species : Potentilla reptans L. A. Flowers solitary, axillary, long-peduncled. Flowers 4-parted ; upper leaves 3-foliolate. Flowers 5-parted ; leaves usually all 5-foliolate (genus Callionia Greene). Pubescence of the stem, petioles and peduncles appressed. Leaflets sparingly silky beneath, dentate nearly to the base. Leaflets densely silky beneath, dentate only above the middle. Pubescence of the stem, petioles and peduncles spreading. B. Flowers cymose. a. Cymes very leafy, several-many-flowered, the flowers or some of them apparently axillary. Mainly annuals or biennials; style fusiform, glandular at the base. Achenes corky-gibbous. Leaves all pinnate ; inflorescence evidently cymose. Upper leaves ternate ; inflorescence falsely racemose. Achenes not gibbous. Leaves all ternate ; stamens 10-20. Petals about half as long as the calyx-lobes ; calyx-tube 2" P. procumbens. P. simplex. P. pumila. P. canadensis. 5. P. 6. P. Nicolletii. Petals more than half as long as the calyx-lobes ; calyx-tube 3J. broad in fruit. 7. P. millegrana, ;" broad in fruit. 8. P. monspeliensis. 9. , Basal leaves apparently 5-foliolate ; stamens 5. Perennials; style filiform, not glandular. Leaves white-tomentose beneath. Jo. P. argentea. Leaves grayish silky beneath. 11. P. intermedia. "b. Cymes not very leafy, usually few-flowered. Leaves digitately divided. Basal leaves 5-9-foliolate, Plant tall, i ° high or more ; introduced. Plants low, less than 8' high ; native boreal species. Basa
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
