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Hymenachne amplexicaulis

Hymenachne amplexicaulis Nees  
Family: Poaceae
West Indian Marsh Grass
[Agrostis monostachya Poir., moreHymenachne acutigluma (Steud.) Gilliland, Hymenachne gouinii E. Fourn., Hymenachne monostachya (Poir.) P. Beauv., Hymenachne pseudointerrupta Müll.Hal., Panicum acutiglumum Steud., Panicum amplexicaule Rudge, Panicum amplexicaule var. deflexum Döll, Panicum amplexicaule var. erectum Döll, Panicum amplexifolium Griseb. ex Mez, Panicum grisebachianum Mez, Panicum hymenachne Desv., Panicum perdensum Steud.]
Hymenachne amplexicaulis image
  • FNA
  • Resources
Mary E. Barkworth. Flora of North America

Plants perennial. Culms to 3.5 m tall, 1 cm or more thick, decumbent. Ligules 1-2.5 mm, brownish; blades 15-33 cm long, 12-28 mm wide, lax, flat, glabrous. Panicles 10-40 cm long, 0.7-1.2 cm thick, spikelike, dense, sometimes lobed near the base; basal branches 1.5-5 cm, strictly erect. Spikelets 3.5-5 mm, lanceolate, acuminate. Lower glumes 1-1.7 mm, 3-veined; upper glumes 2.8-3.9 mm; lower lemmas 3.6-4.6 mm, longer than the upper glumes, attenuate to subaristate; lower paleas absent; upper lemmas 2.5-3.5 mm; anthers 1.1-1.2 mm. 2n = 10.

In the Flora region, Hymenachne amplexicaulis is known only from low, wet pastures in southern Florida and it is rare even in that state. It is more abundant in the remainder of its range which extends through Mexico to Argentina.

Hymenachne amplexicaulis
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University of Florida Herbarium
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University of Florida Herbarium
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University of Florida Herbarium
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University of Florida Herbarium
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Genevieve J Kline
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University of Florida Herbarium
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University of Florida Herbarium
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University of Florida Herbarium
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University of Florida Herbarium
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University of Florida Herbarium
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University of Florida Herbarium
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