. 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 102nd meridian. olete or coroniform, that of the disk-flowers of5-20 subulate scales or bristles somewhat united at the base. Achenes pubescent. [Greek,chaff-around.] Two known species, natives of the south-central United States, the following typical. I. Amphiachyris dracunculoides (DC.)Xutt. Amphiachyris. Fig. 4191. Brachyris dracunculoides DC. Mem. Soc. Phys. Gen. 7: Part 2, 265. pi. I. 1
. 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 102nd meridian. olete or coroniform, that of the disk-flowers of5-20 subulate scales or bristles somewhat united at the base. Achenes pubescent. [Greek,chaff-around.] Two known species, natives of the south-central United States, the following typical. I. Amphiachyris dracunculoides (DC.)Xutt. Amphiachyris. Fig. 4191. Brachyris dracunculoides DC. Mem. Soc. Phys. Gen. 7: Part 2, 265. pi. I. dracunculoides Nutt. Trans. Am. Phil. Soc. (II.) 7: 313. 1841. Annual, slender, much branched, 6-i8 high, thebranches ascending. Leaves hnear, 6-i8 long,i-2 wide, acutish, the uppermost almost fih-form; heads solitary at the ends of short branches,lo-30-flowered, aDout 2 high; involucre hemi-spheric, its bracts oval, obtuse; rays 5-10, aboutas long as the involucre; disk-flowers mostlystaminate, their ovaries abortive, their pappus of5-8 subulate aristate scales, united into a shortcup at the base. In dry soil, Missouri and Kansas to Texas andNew Mexico. Found adventive at Easton, Genus 12. THISTLE FAMILY. 371 12. GRINDELIA Willd. Gesell. Nat. Fr. Bed. Mag. i: 260. 1807. Perennial or biennial herbs, sometimes woody at the base, with alternate sessile or clasp-ing leaves, usually spinulose-dentate, and rather large heads of both discoid and radiateyellow flowers, solitary at the ends of the branches (rays rarely wanting). Involucre hemi-spheric or depressed, its bracts imbricated in several or many series, usually flat or convex, naked, foveolate. Ray-flowers fertile. Disk-flowers perfect, orsometimes only staminate. Anthers obtuse and entire at the base. Style-branches narrow,flattened, their appendages linear or lanceolate. Achenes short, thick, sometimes compressed,glabrous, 4-5-ribbed. Pappus of 2-8 soon deciduous
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
