Poaceae
Pseudoeriocoma

Pseudoeriocoma hirticulmis (S.L.Hatch, Valdés-Reyna & Morden) Romasch.

First published in PhytoKeys 126: 115 (2019)
This species is accepted
The native range of this species is Mexico (Coahuila, Nuevo León). It is a perennial and grows primarily in the subtropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Butt sheaths not bulbous. Culms geniculately ascending; 30-60 cm long; wiry; 6-11 -noded. Culm-internodes distally hispid; with reflexed hairs. Culm-nodes glabrous. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 0.5-1 mm long. Leaf-blades straight, or curved; 1.5-6 cm long; 1 mm wide. Leaf-blade surface pilose; hairy on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; linear; 8-16 cm long; 1-2 cm wide. Primary panicle branches ascending; 2-3 -nate; bearing 2-4 fertile spikelets on each lower branch. Panicle axis with lower internodes 1-4.2 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-13 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 7-10.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 0.7-1 mm long; pubescent; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 7-10.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 0.7-1 mm long; pubescent; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 6-8 mm long; 1.1-1.2 length of upper glume; chartaceous; much thinner on margins; without keels; 3 -veined. Lower glume apex acuminate. Upper glume lanceolate; 6-8 mm long; membranous; with hyaline margins; without keels; 3 -veined. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 3.5-5 mm long; coriaceous; light brown; without keel; 5 -veined. Lemma surface villous. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; with this appendage 0.7-1 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; 29-50 mm long overall; with 11-27 mm long limb; with twisted column. Middle segment of lemma awn 10-13 mm long. Column of lemma awn 8-10 mm long. Palea 3-4 mm long; 2 -veined; without keels. Palea surface pilose; hairy on back.
Morphology Reproductive morphology Flowers
Lodicules 2; 1-1.2 mm long; veinless. Anthers 3; 2 mm long; brown. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis fusiform; 3-4 mm long; light brown. Embryo 0.25 length of caryopsis.
Distribution
North America: Mexico.
Reference
Stipeae. Hatch et al 2004.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0