. 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. Tracaulon arifolium (L.) Raf. Halberd- leaved Tear-thumb. Fig. 1649. Polygonum arifolium L. Sp. PI. 364. 1753. Tracaulon arifolium Raf. Fl. Tell. 3: 13. 1836. Perennial, stem ridged, reclining, 2°-6° long, the ridges armed with recurved prickles. Peduncles and pedicels glandular or pubescent; leaves broadly hastate, long-petioled, i'-io' long, pubescent or g
. 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. Tracaulon arifolium (L.) Raf. Halberd- leaved Tear-thumb. Fig. 1649. Polygonum arifolium L. Sp. PI. 364. 1753. Tracaulon arifolium Raf. Fl. Tell. 3: 13. 1836. Perennial, stem ridged, reclining, 2°-6° long, the ridges armed with recurved prickles. Peduncles and pedicels glandular or pubescent; leaves broadly hastate, long-petioled, i'-io' long, pubescent or glabrous beneath, the apex and basal lobes acumi- nate ; petioles and stronger nerves prickly; ocreae oblique, fringed at the summit with short bristles and at the base with slender prickles; flowers in terminal and axillary heads or racemes; calyx rose- color, or greenish, 4-parted; stamens 6; style 2- parted; achene lenticular, broadly obovate, 2" long, strongly biconvex, dark brown, smooth, shining. In moist or wet soil, New Brunswick and Ontario to Minnesota, south to Georgia. Sickle-grass. Scratch- grass. July-Sept. 11. TINIARIA Webb &Moq.; Webb & Berth. Hist. Nat. Canar. 3: 221. 1836-40. Annual or perennial often scurfy unarmed twining vines. Leaves alternate, mem- branous or leathery, cordate or hastate. Ocreae oblique, naked or fringed at the top or the base. Racemes loosely flowered, axillary or terminal, often paniculate, leafy-bracted or naked. Sepals 5, green, white or yellowish, 2 exterior, 2 interior and 1 with one edge interior and one edge exterior, this sepal and the two outer keeled or strongly and con- spicuously winged. Pedicels slender, reflexed and articulated. Stamens 8, included; fila- ments short, converging. Styles 3, short or almost wanting, distinct or rarely united. Achenes 3-angled, dark brown or black, included, smooth and shining or granular and dull. Endosperm horny. Cotyledons accumbent. [Latin, worm, referring to the habit of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
