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This genus is accepted, and its native range is America, Tropical & S. Africa.
A specimen from Kew's Herbarium

[GB]

nonem

Morphology General Habit
Annual (2), or perennial (18). Rhizomes absent (14), or short (3), or elongated (3). Culms erect (14/16), or geniculately ascending (1/16), or decumbent (1/16), or rambling (1/16), or scandent (1/16); slender (1/2), or weak (1/2); 30-130.9-300 cm long; without nodal roots (1/3), or with prop roots (1/3), or rooting from lower nodes (2/3). Culm-internodes terete (1/1). Culm-nodes constricted (1/1). Lateral branches lacking (2/2). Leaf-sheaths open for most of their length (1/1). Leaf-sheath auricles absent (18), or erect (2). Ligule an eciliate membrane (17), or a ciliolate membrane (2), or a fringe of hairs (1). Leaf-blades filiform (1), or linear (19); herbaceous (19), or coriaceous (1); stiff (2), or firm (18).
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle with branches tipped by a raceme. Panicle open (17), or contracted (3). Primary panicle branches not whorled (19), or whorled at lower nodes (1). Racemes bearing a triad of spikelets (15), or few fertile spikelets (15), or many spikelets (2); 1 fertile spikelets on each (14/16), or 2 fertile spikelets on each (12/16), or 3 fertile spikelets on each (7/16), or 4-7 fertile spikelets on each (2/16), or 8-15 fertile spikelets on each (1/16). Rhachis evident (18), or obsolete (2); tough (2), or fragile at the nodes (18). Spikelet packing contiguous (17/18), or lax (1/18). Rhachis internodes indefinite (1/18), or filiform (17/18). Rhachis internode tip oblique (1/1). Spikelets ascending (1/1); in pairs (17), or in threes (14). Fertile spikelets sessile, or sessile and pedicelled (2); 1 in the cluster, or 2 in the cluster (2). Companion sterile spikelets pedicelled; 0 in the cluster (2), or 1 in the cluster (17), or 2 in the cluster (14). Pedicels filiform.
Sterile
Companion sterile spikelets represented by barren pedicels.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (19), or oblong (1), or ovate (2); dorsally compressed; 3.5-6.137-11 mm long; falling entire; deciduous from the base (2), or with accessory branch structures. Spikelet callus brief (15), or oblong (2), or cuneate (1), or linear (2); pubescent (7), or pilose (9), or bearded (4); base obtuse (16), or acute (1), or pungent (3); attached obliquely (1/1). Companion sterile spikelets represented by barren pedicels.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (19), or oblong (1), or ovate (2); dorsally compressed; 3.5-6.137-11 mm long; falling entire; deciduous from the base (2), or with accessory branch structures. Spikelet callus brief (15), or oblong (2), or cuneate (1), or linear (2); pubescent (7), or pilose (9), or bearded (4); base obtuse (16), or acute (1), or pungent (3); attached obliquely (1/1).
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes exceeding apex of florets (1/1); firmer than fertile lemma. Lower glume lanceolate (1), or oblong (17), or ovate (2); chartaceous (2), or coriaceous; without keels; 7-8 -veined (13/17), or 9 -veined (17/17). Lower glume lateral veins obscure (2), or distinct (18). Lower glume surface smooth (19), or asperulous (1); glabrous (1), or pubescent (12), or pilose (7), or villous (1); without hair tufts (19), or with an apical beard (1). Lower glume apex entire (19), or dentate (1); 2 -fid (1/1); truncate (17/17). Upper glume lanceolate (2), or oblong (17), or ovate (1); chartaceous (2/14), or coriaceous (14/14); without keels (19), or 1-keeled (1); 3 -veined (1/15), or 5 -veined (14/15). Upper glume surface smooth (19), or asperulous (1); glabrous, or pubescent (1). Upper glume apex acute (14/14).
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate (1), or oblong (19); hyaline; 2 -veined (19), or 3 -veined (1). Fertile lemma oblong; hyaline; without keel; 1-2 -veined (1/15), or 3 -veined (13/15). Lemma surface smooth (19), or asperulous (1); glabrous (19), or pilose (1). Lemma margins eciliate (4), or ciliolate (16). Lemma apex entire (2), or dentate (2), or lobed (16); 2 -fid (18/18); incised 0.2 of lemma length; muticous (2), or awned; 1 -awned. Principal lemma awn apical (2), or from a sinus (18); straight (5), or geniculate (9), or bigeniculate (11). Column of lemma awn glabrous (3/18), or hispidulous (14/18), or pubescent (2/18). Palea absent or minute.
Morphology Reproductive morphology Flowers
Lodicules 2 (17/17). Anthers 3 (15/15). Stigmas 2 (1/1).
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp (1/1); oblanceolate (1/1).
Distribution
Africa (6), or Australasia (1), or North America (9), or South America (13).

[FTEA]

Gramineae, W. D. Clayton, S. M. Phillips And S. A. Renvoize. Flora of Tropical East Africa. 1974

Morphology General Habit
Annuals or perennials; culms hollow
Morphology Leaves
Leaf-blades linear; ligule scarious
Morphology Reproductive morphology Inflorescences
Inflorescence a terminal panicle, the primary branches semi-verticillate, dividing into flexuous peduncles bearing short fragile racemes (these sometimes reduced to a single sessile spikelet); internodes filiform, ciliate
Morphology Reproductive morphology Inflorescences Spikelets
Sessile spikelet dorsally compressed; callus obtuse to pungent, without a conspicuous beard (except S. pogonostachyum);lower glume coriaceous, brown, broadly convex across the back; lower floret reduced to a hyaline lemma; upper lemma hyaline, bidentate (entire in S. pogonstachyum), with a straight or geniculate awn, rarely awnless Pedicelled spikelet reduced to a filiform ciliate barren pedicel somewhat shorter than the sessile spikelet, but this sometimes bearing a spikelet which is then similar to the sessile.
Sessile
Sessile spikelet dorsally compressed; callus obtuse to pungent, without a conspicuous beard (except S. pogonostachyum);lower glume coriaceous, brown, broadly convex across the back; lower floret reduced to a hyaline lemma; upper lemma hyaline, bidentate (entire in S. pogonstachyum), with a straight or geniculate awn, rarely awnless
Morphology Reproductive morphology Fruits
Caryopsis oblong
Pedicelled
Pedicelled spikelet reduced to a filiform ciliate barren pedicel somewhat shorter than the sessile spikelet, but this sometimes bearing a spikelet which is then similar to the sessile.

[FZ]

Gramineae, T. A. Cope. Flora Zambesiaca 10:4. 2002

Morphology General Habit
Annuals or perennials.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle, the subdivided primary branches bearing short racemes, these sometimes reduced to triads.
Morphology Reproductive morphology Inflorescences Spikelets
Sessile spikelet callus obtuse or pungent (with involucral hairs in S. pogonostachyum); inferior glume coriaceous, convex, keeled at the apex; superior glume broadly convex; superior lemma mostly entire, sometimes bilobed, awned. Pedicelled spikelets usually reduced to a barren pedicel, but present and bisexual in S. pogonostachyum and S. fuscescens.

Native to:

Alabama, Angola, Argentina Northeast, Argentina Northwest, Arizona, Arkansas, Bahamas, Belize, Benin, Bolivia, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Burkina, Burundi, Cameroon, Caprivi Strip, Central African Repu, Chad, Colombia, Colorado, Congo, Connecticut, Costa Rica, Cuba, Delaware, District of Columbia, Dominican Republic, Ethiopia, Florida, French Guiana, Gabon, Gambia, Georgia, Ghana, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, Illinois, Indiana, Iowa, Ivory Coast, Jamaica, Kansas, Kentucky, Kenya, KwaZulu-Natal, Louisiana, Maine, Malawi, Mali, Manitoba, Maryland, Massachusetts, Mauritania, Mexican Pacific Is., Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Mozambique, Namibia, Nebraska, New Hampshire, New Jersey, New Mexico, New York, Nicaragua, Niger, Nigeria, North Carolina, North Dakota, Northern Provinces, Ohio, Oklahoma, Ontario, Panamá, Paraguay, Pennsylvania, Puerto Rico, Québec, Rhode I., Saskatchewan, Senegal, Sierra Leone, South Carolina, South Dakota, Sudan, Swaziland, Tanzania, Tennessee, Texas, Togo, Trinidad-Tobago, Uganda, Uruguay, Utah, Venezuela, Vermont, Virginia, West Virginia, Wisconsin, Wyoming, Zambia, Zaïre, Zimbabwe

Introduced into:

Ecuador, Madagascar, Peru, Suriname

Sorghastrum Nash appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Longhi-Wagner, H.M. [9254], Brazil K001106140

First published in N.L.Britton, Man. Fl. N. States: 71 (1901)

Accepted by

  • (2020). oi: https://doi.org/10.1101/2020.07.29.226753 epublication.
  • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

Literature

Flora of West Tropical Africa

  • in Britton, Man. Fl. North U.S. 71 (1901).

Flora Zambesiaca

  • in Britton, Man. Fl. N. States: 71 (1901).

Flora of Tropical East Africa

  • in Britton, Man. Fl. North. U.S.: 71 (1901)

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

GrassBase - The Online World Grass Flora
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0