Puccinellia howellii J.I.Davis

First published in Madroño 37: 55 (1990)
This species is accepted
The native range of this species is N. California. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms erect, or geniculately ascending; 7-40 cm long. Leaf-sheaths open for most of their length. Ligule an eciliate membrane; 1.5-2.7 mm long; entire, or erose; obtuse. Leaf-blades involute; 1.4-2.2 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 7-12 cm long. Primary panicle branches appressed, or ascending. Panicle branches smooth; glabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels glabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3-7.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 2-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3-7.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 0.8-1.9 mm long; 0.5-0.75 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse, or acute. Upper glume oblong; 1.7-2.5 mm long; 0.75 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume lateral veins obscure. Upper glume apex obtuse, or acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma elliptic, or ovate; 2.4-3.3 mm long; membranous; much thinner above; without keel; 5 -veined. Lemma lateral veins obscure; stopping well short of apex. Lemma margins scabrous (above). Lemma apex obtuse, or acute. Palea 1 length of lemma; 2 -veined. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 1.5-2 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ovoid; 1.5-2 mm long; green, or light brown. Embryo 0.25-0.33 length of caryopsis. Hilum punctiform.
Distribution
North America: southwest USA.
Reference
Poeae. Davis 2005.
[GB]

Sources

  • 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 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 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 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0