Contains 19 accepted taxa overall.
Characteristics
Classification
Citation
ANDROPOGON Linnaeus, Sp. Pl. 1045. 1753, nom. cons.
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TYPE: Andropogon distachyos Linnaeus, typ. cons.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Andropogon arctatus | PINEWOODS BLUESTEM | Native Threatened-State FAC (NWPL) FAC (DEP) | ||
| Andropogon bicornis | BARBAS DE INDIO | Not Native FAC (NWPL) | ||
| Andropogon brachystachyus | SHORTSPIKE BLUESTEM | Native FAC (NWPL) FAC (DEP) | ||
| Andropogon cumulicola | Native | |||
| Andropogon floridanus | FLORIDA BLUESTEM | Native FACU (NWPL) | ||
| Andropogon gerardi | BIG BLUESTEM | Native FAC (NWPL) FAC (DEP) | ||
| Andropogon glomeratus var. glaucopsis | PURPLE BLUESTEM | Native FACW (NWPL) OD (WAP) FACW (DEP) | ||
| Andropogon glomeratus var. glomeratus | BUSHY BLUESTEM | Native FACW (NWPL) T (WAP) FACW (DEP) | ||
| Andropogon glomeratus var. hirsutior | BUSHY BLUESTEM | Native FACW (NWPL) FACW (DEP) | ||
| Andropogon glomeratus var. pumilus | BUSHY BLUESTEM | Native FACW (DEP) | ||
| Andropogon gyrans | ELLIOTT'S BLUESTEM | Native FACU (NWPL) FAC (DEP) | ||
| Andropogon liebmannii var. pungensis | Native FACW (NWPL) FACW (DEP) | |||
| Andropogon longiberbis | HAIRY BLUESTEM | Native FAC (NWPL) | ||
| Andropogon perangustatus | ELLIOTT'S BLUESTEM | Native OBL (NWPL) FAC (DEP) | ||
| Andropogon ternarius | SPLITBEARD BLUESTEM | Native FACU (NWPL) | ||
| Andropogon tracyi | TRACY'S BLUESTEM | Native | ||
| Andropogon virginicus var. decipiens | BROOMSEDGE BLUESTEM | Native FAC (NWPL) AD (WAP) FAC (DEP) | ||
| Andropogon virginicus var. glaucus | CHALKY BLUESTEM | Native FAC (NWPL) U (WAP) FAC (DEP) | ||
| Andropogon virginicus var. virginicus | BROOMSEDGE BLUESTEM | Native FAC (NWPL) AD (WAP) FAC (DEP) |
Identification Key
1. Rhizomes sometimes present; pedicellate spikelets usually well-developed, (3.5)6-12 mm long, usually staminate; sessile spikelets 5-12 mm long
1. Cespitose; pedicellate spikelets usually vestigial or absent, or occasionally well-developed and staminate in terminal spikelet units; sessile spikelets 2.6-8.4 mm long (Anatherum, Andropogon sect. Leptopogon)
2
2. Rames usually conspicuously wholly exserted or nearly so, and mostly distant from adjacent ones; anthers 1 or 3, 1.2-3.5 mm long
2. Rames usually at least partly concealed by the subtending sheath and sometimes in dense arrays; anthers 1, 0.5-2
1. (Key A) Inflorescence peduncles (5)5-9(11.5) cm long; rame internode pubescence uniform; sessile spikelets 4–5 mm long; lemma awns mostly 5–10 mm long; anthers 1
2
1. Inflorescence peduncles (8)9–17 cm long; rame internode pubescence becomgin sparse basally; sessile spikelets 5–7 mm long; lemma awns mostly 10–25 mm long; anthers 3
2
2. Culms 2.5–4.5 mm wide; basal leaf sheaths appressed-pubescent, often silvery-silky; basal leaf blades 5–6 mm wide, upper surface appressed-pubescent, often silvery-silky; inflorescence units (10)30-40(50) per culm, each with 2–4 rames
2. Culms 1.5–2.0 mm wide; basal leaf sheaths moderately to densely villous; basal leaf blades 2–2.5 mm wide, glabrous to sparsely pubescent with spreading hairs; inflorescence units (3)8-14(27) per culm, all with 2 rames
3. Rame internodes with longest hairs 8–9 mm long, somewhat obscuring the spikelets; first glume nerveless and glabrous or nearly so between the keels; lemma awns (18)20-22(25) mm long; pedicellate spikelet vestigal, 1–2 mm long
3. Rame internodes with longest hairs 3–6 mm long, not obscuring the spikelets; first glume 2–3-nerved between the keels, its surface moderately to densely scabridulous; lemma awns (9)11-16(18) mm long; pedicellate spikelets, 2–4 mm long
4
4. Culms (1.1)1.4-1.7(1.9) m tall; basal leaf sheaths and lower surface of basal leaf blades green or bluish-green, not glaucous; culm internodes not glaucous; inflorescence units (5)10-20(26) per culm
4. Culms (1.5)1.8-2.1(2.3) m tall; basal leaf sheaths and lower surface of basal leaf blades bluish-glaucous; culm internodes slightly to evidently glaucous; inflorescence units (6)8-10(12) per culm
1. (Key B) Leaves strongly chalky-glaucous
2
1. Leaves green to slightly glaucous
3
2. Ligule 0.9-2 mm long (excluding cilia), the cilia 0-0.2 mm long; cauline leaf blades 33-75 cm long; pubescence below raceme sheath usually moderate to dense; racemes (1)1.3-2(2.3) cm long
2. Ligule 0.2-0.5 mm long (excluding cilia), the cilia 0.3-1.2 mm long; cauline leaf blades 12-38 cm long; pubescence below raceme sheath absent or sparse to dense; racemes (1.4)1.8-2.7(4) cm long
3
3. Pubescence below raceme sheath absent; raceme sheaths (2.1)2.6-3.8(4.9) cm long; racemes (1.4)1.7-2.4(3.2) cm long; spikelets (2.6)3.4-3.7(4.4) mm long
3. Pubescence below raceme sheath sparse to dense; raceme sheaths (2.4)3.2-4.8(6) cm long; racemese (1.5)2-3(4) cm long; spikelets (3)3.5-3.9(4.9) mm long
4. Spikelets lacking awns; anthers 3
4. Sessile spikelets with awns; anthers 1(-3)
5
5. Leaf blades appressed-pubescent; peduncles (1)3-4(13) mm long; callus (base of sessile spikelet) hairs 1.5-5 mm long; sessile spikelets (3.5)4.1-4.5(5) mm long
5. Leaf blades glabrous or with mostly spreading (rarely appressed) hairs; peduncles (1)5-70(100) mm long; callus hairs 1-3(3.5) mm long; sessile spikelets (2.6)3.5-5(5.5) mm long
6
6. Peduncles with (2)4-13 rames
6. Peduncles with (1)2-5(7) rames
7
7. Culms 0.3-1.2(1.4) m tall; leaf blades 0.8-3(5) mm wide; inflorescence units 2-31 per culm
10
7. Culms (0.2)0.9-3.1 m tall; leaf blades (1.7)3-9.5 mm wide; inflorescence unites 5-210 per culm
13
8. Peduncles with 2 rames; anthers 1.2-2 mm long; sessile spikelets (4)4.8-5(5.5) mm long
8. Peduncles with 2-5 rames; anthers 0.6-1.7 mm long; sessile spikelets (3)4.1-4.4(5.7) mm long
11
11. Ligules 0.8-1.5 mm long, the cilia <0.1 mm long
11. Ligules 0.2-0.8(1) mm long
12
12. Basal leaf sheath faces appressed-pubescent, 2.5-5 mm wide from keel to keel; basal leaf blades 2-5 mm wide unfolded, not difficult to unfold; upper culm sheaths 6.6-8.5 mm wide when unrolled; rachis internode 3.8-5 mm long; pedicel 5.6-8 mm long
12. Basal leaf sheaths faces glabrous, (0.5)1.4-2.6(3) mm wide from keel to keel; basal leaf blades (0.6)1-2.2(2.8) mm wide unfolded, very difficult to unfold; upper culm sheaths (4)4.7-6.3(7) mm wide when unrolled; rachis internode (2.5)3-3.8(4) mm long; pedicel 4.5-5.6(5.8) mm long
13. Culm 1-3 m long; inflorescence branches arching; rames (1.2)1.5-2.1(2.6) cm long
13. Culms 0.3-2.5 m long; inflorescence branches erect to ascending; rames (0.5)1.7-5.3 cm long
14
14. Leaf blades 32-61 cm long, usually glabrous; sheaths often scabrous; inflorescence units (9)50-210 per culm; rame internode hairs uniform (not sparse basally); anthers 1.3-2 mm long
14. Leaf blades 11-109 cm long, glabrous to densely pubescnet; sheath smooth to scabrous; inflorescence units 6-600 per culm; rame internodes sparsely pubescent basally, more densely pubescent distally; anthers 0.5-1.5 mm long
15
15. Leaf blades 13-109 cm long; sheaths usually scabrous, sometimes smooth; ligules 0.6-2.2 mm long; keels of the lower glumes sometimes scabrous below midlength
16
15. Leaf blades 11-52 cm long; sheaths smooth, rarely somewhat scabrous; ligules 0.2-1 mm long; keels of the lower glumes usually smooth below midlength, scabrous distally
18
16. Leaf sheaths usually smooth; ligules ciliate, the cilia 0.2-0.9 mm long; sheaths subtending the inflorescence units 1.5-3 mm wide;
16. Leaf sheaths often scabrous; ligules, when ciliate, with the cilia no more than 0.5 mm long; sheaths subtending the inflorescence units (1.5)2.3-3.4(4.4) mm wide
17
17. Leaves usually glabrate to sparsely pilose; upper portion of the plants oblong to obpyramidal; mature peduncles (4)11-35(60) mm long; anthers eventually falling
17. Leaves densely villous; upper portion of the plants cylindrical to oblong; mature peduncles 2-5 (8) mm long; withered remnants of anthers retained within the spikelets
18. Sheaths subtending the inflorescence units (1.7)2.4-3.1(4) mm wide; inflorescences units usually with 2 rames; peduncles (1) 4-9 (30) mm long; rames (1.3)1.5-2.3(3) cm long
18. Sheaths subtending the inflorescences units (2.2)3.3-4.4(5.6) mm wide; inflorescence units with 2-5(7) rames; peduncles (2)3-6(12) mm long; rames (0.5)1.9-3.3(4.4) cm long
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Anatherum | Anatherum Palisot de Beauvois, Ess. Agrostogr. 128, 150, pl. 22(10-11). 1812. | TYPE: Anatherum bicorne (Linnaeus) Palisot de Beauvois (Andropogon bicorne Linnaeus) Lectotypified by Niles & Chase, Contr. U.S. Natl. Herb. 24: 203. 1925. | |
| Arthrolophis | Arthrolophis Chiovenda, Boll. Soc. Bot. Ital. 1917: 57. 1917. | TYPE: Non designatus. | |
| Arthrostachys | Arthrostachys Desvaux, Mém. Soc. Agric. Angers 1: 178, t. 9(2). 1831; Opusc. Sci. Phys. Nat. 74, t. 6(2). 1831-1833. | TYPE: Arthrostachys gracilis Desvaux | |
| Diectomis | Diectomis Kunth, Mém. Must. Hist. Nat. 2: 69. 1815, nom. cons. vs. Diectomis Palisot de Beauvois 1812. | TYPE: Diectomis fastigiata (Swartz) Palisot de Beauvois, typ. cons. (Andropogon fastigiatus Swartz) | |
| Dimeiostemon | Dimeiostemon Rafinesque, Neogenyton 4. 1825. | TYPE: Andropogon vaginatus Elliott Lectotypified by Hitchcock, U.S.D.A. Bull. (1915-1923) 772: 260. 1920. | |
| Euklastaxon | Euklastaxon Steudel, Syn. Pl. Glumac. 1: 412. 1854 ("1855"). | TYPE: Euklastaxon tenuifolius Steudel | |
| Heterochloa | Heterochloa Desvaux, Opusc. Sci. Phys. Nat. 66, pl. 5(3). 1831. | TYPE: Heterochloa alopecurus Desvaux | |
| Homoeatherum | Homoeatherum C. Nees von Esenbeck, in Lindley, Nat. Syst., ed. 2. 448. 1836. | TYPE: Homoeatherum chinense C. Nees von Esenbeck | |
| Hypogynium | Hypogynium C. Nees von Esenbeck, in Martius, Fl. Bras. Enum. Pl. 2(1): 364. 1829. | TYPE: Non designatus. | |
| Leptopogon | Leptopogon Roberty, Boissiera 9: 193. 1960, non Borzi 1907. | TYPE: Non designatus. |