University of Michigan Herbarium
Catalog #: 1426218
Occurrence ID (GUID): a80b8b00-fadc-44bb-9625-5cf75f2629b5
Taxon: Achnatherum swallenii (C.L. Hitchc. & Spellenb.) Barkworth
Family: Poaceae
Collector: R. Spellenberg   1731   
Date: 1967-06-14
Verbatim Date: June 14, 1967
Locality: United States, Idaho, Custer, about 12 mi. n. w. of Mackay on hi way, alt. 93, 1.8 mi. s. of Elktiorn Creek, T8 N, R22 E, Sec. 2.
Verbatim Coordinates: TRS: T8N R22E sec 2
Habitat: growing on alluvial fan of rocky calcareous soil
Associated Species: Astragalus calycosus, Sitanion hystrix, Poa gracillima, Agro- pyron spicatum, Artemisia frigida, Lesquerella alpina var. laevis, Phlox muscoides, Musineon divaricatum, Arte- misia tridentata, Opuntia polycantha, Coryphantha missouriensis, Oryzopsis hymenoides
Description: Plants forming dense tufts to about 20 cm. across. On live plants, a slight pull disarticulates the awn from the lemma. Mature fruits collected from plants grown outdoors at Seattle are as follows: body about 3.5 mm. long, 1 mm. broad; lemma gray-brown with silvery appressed pubescence; margins of the lemma . 3-. 5 mm. apart, exposing the palea, extending a two whitish, nearly hyaline, acute lobes almost. 5 mm. long past the base of the awn; awn once geniculate, the bend in the lower 1/3. Plants in this population had chromosome complements of N=17jj, 2N=34;
Specimen Images
Record ID: a80b8b00-fadc-44bb-9625-5cf75f2629b5
For additional information on this specimen, please contact: Richard Rabeler, Collections Manager (
Current Record
University of Michigan Herbarium (MICH)
R. Spellenberg 17311967-06-14
Catalog Number: 1426218
GUID: a80b8b00-fadc-44bb-9625-5cf75f2629b5
Latest Identification: Achnatherum swallenii (C.L. Hitchc. & Spellenb.) Barkworth

Intermountain Herbarium (Vascular plants & algae) (USU:UTC)
R Spellenberg 17311967-06-14
Catalog Number: UTC00120970
GUID: USU:UTC:120970
Latest Identification: Achnatherum swallenii (C.L. Hitchc. & Spellenb.) Barkwort
Identified by: R. Spellenberg

New Mexico State University Herbarium (NMC)
R.W. Spellenberg 17311967-06-14
Catalog Number: 35883
Latest Identification: Oryzopsis swallenii C.L. Hitchc. & Spellenb.

Oregon State University (OSC:OSU)
R Spellenberg 17311967-06-14
Catalog Number: ORE6491
GUID: {2B1E909D-4339-4516-8A4F-4E78E7A6881D}
Latest Identification: Achnatherum swallenii (C.L. Hitchc. & Spellenb.) Barkworth
Identified by: Halse, R.2007 - Jan - 11

New York Botanical Garden Steere Herbarium (NY)
R. W. Spellenberg 17311967-06-14
Catalog Number: 1553970
GUID: 9918e0c9-481d-414f-ad08-7eb36477bc7c
Latest Identification: Achnatherum swallenii (C.L.Hitchc. & Spellenb.) Barkworth

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