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Agrostis hendersonii
HENDERSON'S BENT GRASS

Higher Taxonomy
Family: Poaceae (Gramineae)View DescriptionDichotomous Key

Common Name: GRASS FAMILY
Habit: Annual to woody perennial herb; roots generally fibrous. Stem: generally round, hollow; nodes swollen, solid. Leaf: alternate, 2-ranked, generally linear, parallel-veined; sheath generally open; ligule membranous or hairy, at blade base. Inflorescence: various (of generally many spikelets). Spikelet: glumes generally 2; florets (lemma, palea, flower) 1--many; lemma generally membranous, sometimes glume-like; palea generally +- transparent, +- enclosed by lemma. Flower: generally bisexual, minute; perianth vestigial; stamens generally 3; stigmas generally 2, generally plumose. Fruit: grain, sometimes achene- or utricle-like.
Genera In Family: 650--900 genera; +- 10550 species: worldwide; greatest economic importance of any family (wheat, rice, maize, millet, sorghum, sugar cane, forage crops, ornamental, weeds; thatching, weaving, building materials). Note: Generally wind-pollinated. Achnatherum, Ampelodesmos, Hesperostipa, Nassella, Piptatherum, Piptochaetium, Ptilagrostis moved to Stipa; Elytrigia, Leymus, Pascopyrum, Pseudoroegneria, Taeniatherum to Elymus; Hierochloe to Anthoxanthum; Lolium, Vulpia to Festuca; Lycurus to Muhlenbergia; Monanthochloe to Distichlis; Pleuraphis to Hilaria; Rhynchelytrum to Melinis. The following taxa (in genera not included here), recorded in California from historical collections or reported in literature, are extirpated, lacking vouchers, or not considered naturalized: Acrachne racemosa (Roth) Ohwi, Allolepis texana (Vasey) Soderstr. & H.F. Decker, Amphibromus nervosus (Hook. f.) Baill., Axonopus affinis Chase, Axonopus fissifolius (Raddi) Kuhlm., Coix lacryma-jobi L., Cutandia memphitica (Spreng.) K. Richt., Dinebra retroflexa (Vahl) Panz., Eremochloa ciliaris (L.) Merr., Eustachys distichophylla (Lag.) Nees, Gaudinia fragilis (L.) P. Beauv., Miscanthus sinensis Andersson, Neyraudia arundinacea (L.) Henrard, Phyllostachys aurea Rivière & C. Rivière, Phyllostachys bambusoides Siebold & Zuccarini, Rottboellia cochinchinensis (Lour.) Clayton, Schedonnardus paniculatus (Nutt.) Branner & Coville, Schizachyrium cirratum (Hack.) Wooton & Standl., Schizachyrium scoparium (Michx.) Nash, Themeda quadrivalvis (L.) Kuntze, Thysanolaena latifolia (Hornem.) Honda, Tribolium obliterum (Hemsl.) Renvoize, Zea mays L., Zizania palustris L. var. interior (Fassett) Dore, Zoysia japonica Steud. Paspalum pubiflorum E. Fourn., Paspalum quadrifarium Lam., are now reported for southern California (J Bot Res Inst Texas 4:761--770). See Glossary p. 30 for illustrations of general family characteristics.
eFlora Treatment Author: James P. Smith, Jr., except as noted
Scientific Editor: James P. Smith, Jr., J. Travis Columbus, Dieter H. Wilken.
Genus: AgrostisView DescriptionDichotomous Key

Common Name: BENT GRASS
Habit: Annual or perennial herb, generally tufted, occasionally from rhizomes or stolons. Stem: generally erect. Leaf: sheath generally smooth, glabrous; ligule membranous; blade flat to rolled. Inflorescence: panicle-like, densely cylindric to openly ovate. Spikelet: glumes generally subequal, back generally glabrous, vein generally finely scabrous, 1-veined, generally acute; floret 1, < glumes, generally breaking above glumes; callus glabrous to densely hairy; lemma generally 5-veined, veins not converging, occasionally extended as short teeth, awned from back or not; palea generally 0 or << lemma, translucent; anthers generally 3.
Species In Genus: +- 220 species: especially temperate America, Eurasia. Etymology: (Greek: pasture) Note: Some cultivated in pastures, lawns. Agropogon lutosus (Poir.) P. Fourn. is a sterile hybrid between Agrostis stolonifera and Polypogon monspeliensis. Agrostis viridis is treated as Polypogon viridis. Agrostis nebulosa Boiss. & Reut. is reported for California (FNANM 24: 661), but no specimens have been located. Generic delimitation adopted here reflects editorial preference. Agrostis lacuna-vernalis newly described, added as native.
eFlora Treatment Author: Paul M. Peterson & Michael J. Harvey

Agrostis hendersonii Hitchc.
NATIVE
Habit: Annual 6--70 cm. Leaf: ligule 1--4 mm; proximal blades 1--4 cm, +- 1 mm wide, flat to weakly inrolled. Inflorescence: 1--5 cm, cylindric, dense; 1° branches < 0.5 cm, ascending to +- appressed. Spikelet: glumes 5--7 mm, tip narrowly acuminate to awn-like; callus hairs +- 0.7 mm; lemma 2--4 mm, awned +- at middle, awn 8--10 mm, +- bent; palea 0; anthers +- 0.5 mm. Chromosomes: 2n=42.
Ecology: Vernal pools; Elevation: < 300 m. Bioregional Distribution: CaRF, n SNF, ScV, n SnJV; Distribution Outside California: Oregon. Flowering Time: May--Jul
Synonyms: Agrostis microphylla Steud. var. hendersonii (Hitchc.) Beetle
eFlora Treatment Author: Paul M. Peterson & Michael J. Harvey
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Citation for this treatment: Paul M. Peterson & Michael J. Harvey 2016. Agrostis hendersonii, Revision 2, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=12291, accessed on May 28, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 28, 2016.


Agrostis hendersonii
click for enlargement
© 2005 Steve Matson
Agrostis hendersonii
click for enlargement
© 2005 Steve Matson
Agrostis hendersonii
click for enlargement
© 2005 Steve Matson
Agrostis hendersonii
click for enlargement
© 2005 Steve Matson
Agrostis hendersonii
click for enlargement
© 2005 Steve Matson

More photos of Agrostis hendersonii in CalPhotos


Geographic subdivisions for Agrostis hendersonii:
CaRF, n SNF, ScV, n SnJV;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.