Mentioned on page 327. Herbs, erect, simple or sparingly branched, 1.5–4 (–10) dm, white scurfy. Stems aging red, terete or obscurely angled, brittle. Leaves
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Shrubs, erect, forming slender to rounded or flat-topped bush, (1.4–) 2–6 (–10) dm. Stems: internodes 4-lined at first, then terete. Leaf-blades narrowly oblong
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9. Treatment on page 484. Mentioned on page 481, 483. Plants 50–80 (–100) dm. Branches mostly purplish brown or dark reddish-brown, glabrous; thorns present
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Volume 9. Treatment on page 636. Mentioned on page 531. Shrubs or trees, 40–60 dm. Stems: twigs: new growth not recorded, 1-year old bright redbrown, older
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in FNA Volume 9. Treatment on page 471. Mentioned on page 469. Plants 20–40 dm. Stems: thorns sparse; young twigs tomentose, hairs dense grayish or yellowish
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page 361. Mentioned on page 355, 363. Shrubs or trees, not suckering, 40–120 dm, not thorny. Twigs with terminal end buds, glabrous. Leaves persistent; petiole
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Copyright: Flora of North America Association Herbs, perennial, cespitose, 5–10 dm. Culms erect, 2–5 mm diam., smooth. Cataphylls 1–2, straw-colored, apex rounded
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Schlechtendal) A. Heller Treatment appears in FNA Volume 10. Herbs perennial, 1–4 dm, with fibrous-roots. Stems often several from base, erect to decumbent, branched
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FNA Volume 12. Treatment on page 472. Mentioned on page 471. Shrubs 10–30 dm. Branches erect to ascending. Leaves: petiole 1–3 mm, sparsely to densely
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1868 Treatment appears in FNA Volume 22. Herbs, perennial, cespitose, 2–7 dm. Culms erect, 1–4 mm diam., smooth. Cataphylls 1–2, straw-colored to pink
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long-creeping rhizomes at aerenchymatous base and from mid and distal nodes, 3–10 dm. Stems: internodes 4-lined. Leaves ascending to deflexed, sessile; blade narrowly
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373. Mentioned on page 359. Shrubs, suckering unknown, much branched, 10–40 dm, thorny. Twigs with axillary end buds, glabrous. Leaves deciduous; petiole
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Bound. 2(1): 200. 1859 Treatment appears in FNA Volume 12. Treatment on page 188. Mentioned on page 156, 184, 185. Subshrubs, 2.5–5 dm. Stems erect to
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Mentioned on page 331, 333. Shrubs, monoecious (often apparently dioecious), 5–10 dm. Stems sparsely branched, branches ascending, longest leafy branchlets to
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pumilum A. Gray Treatment appears in FNA Volume 10. Herbs perennial, slender, 1.5–4dm, green to slightly gray glaucous, glabrous. Stems from creeping rhizome,
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78. Mentioned on page 75, 79. Shrubs, erect, forming rounded clumps, 5–15 dm. Stems: internodes 6-lined at first, soon 4-lined, then terete. Leaf-blades
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Treatment on page 638. Mentioned on page 543, 639. Shrubs or trees, 50–70 dm. Stems: twigs: new growth pubescent, 1-year old light gray-brown, older grayish;
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robustus Engelmann Treatment appears in FNA Volume 22. Herbs, perennial, cespitose, 3–10 dm. Roots without terminal tubers. Culms erect, terete, 4–6 mm diam., smooth
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perennial, cespitose, generally light green to yellowish green when dry, to 4.8 dm, not glaucous. Stems branched, with 1 node, 1.4–2.3 mm wide, glabrous, margins
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Treatment on page 368. Mentioned on page 357, 359, 369. Trees, not suckering, 60–200 dm, not thorny. Twigs with terminal end buds, glabrous. Leaves deciduous; petiole
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