Rhyolitic volcanic rocks are generally characterized by rich alkali, silicon, aluminum,and poor calcium, magnesium. They have relatively high Rb,Th and rather low Ba,Sr,Ti,P,and exhibit obviouslv negative europium anomaly (δEu=0.16~0.44).The εNd values of the rhyolitic volcanic rocks range from -5.93 to -2022.Basalts and rhyolites in different cycles show clear geochemical variance.

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Racemes (4–)10–40(–100),(8–)10–30 cm; rachis internodes glabrous, scaberulous or smooth, nodes glabrous; lower pedicel 0.5–1.5 mm, upper pedicel 1.5–4 mm. Spikelets 4–6.5 mm, pilose or glabrous, awned; callus hairs 5–8 mm, exceeding the spikelet; glumes subequal, membranous, 4–6.5 mm, 5-veined, back glabrous or pilose, puberulous at apex and along upper margins, apex acuminate; lower lemma lanceolate, hyaline, 3.5–4 mm, veinless, apex and margins puberulous, otherwise glabrous; upper lemma similar to lower, 2.5–3.5 mm; awn geniculate, 4–12 mm; upper palea a 1–2 mm scale.

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Leaf sheaths glabrous or loosely pilose, mouth glabrous or bearded; leaf blades flat, up to 12 cm, 2–7 mm wide, glabrous or loosely pilose, smooth or scabrid, apex acuminate; ligule 1–3 mm, obtuse.

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Corolla light purple-red, rarely yellow, tubular-campanulate; throat appendages 5, lanceolate, with papillate glands; limb 5-lobed; lobes triangular to semiorbicular, margin dentate, apex sometimes revolute.

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Adult leaves pilose along midvein, 3-veined, stipules subulate, 1.5-3 mm; female bracts broadly ovate, subglabrous; ovary densely setulose; capsule scattered shortly softly setose.

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Leaves strigillose or glabrescent, densely black glandular striate and punctate; crest of calyx lobes decurrent forming a spur

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Stems 3-25(-45) cm tall, strigillose; leaves 0.8-3 cm, obtuse, with 3-7 indistinct teeth per side; seeds 1.2-1.8 mm, finely papillose or reticulate

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Plants strigillose, villous, and/or glandular pubescent, but not tomentose; plants forming stolons or turions, not leafy rosettes; petals 4-8 mm except to 15 mm in E.

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Leaves pale green, with inconspicuous veins; sepals 12-22(-28) mm; stems densely or sparsely strigillose and villous; inflorescence relatively open, apex obtuse from erect to slightly spreading bracts.

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Leaves bright green, with white or red veins, strigillose to subglabrous, sessile to shortly petiolate; rosette blade 10-30 × 1-4 cm; cauline blade lanceolate to narrowly elliptic or narrowly oblanceolate, 4-18 × 1-3 cm, base attenuate, margin dentate, apex acute.

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