Urochloa

Contains 7 accepted taxa overall.

Characteristics
Urochloa P.Beauv.
POACEAE
SIGNALGRASS
View specimens within this family
The genus Eriochloa is embedded within the Urochloa lineage (Salariato et al. 2010) and Webster (1987) had noted their close relationship.
Classification
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POALES
Urochloa
Citation
UROCHLOA Palisot de Beauvois, Ess. Agrostogr. 52. 1812.
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TYPE: Urochloa panicoides Palisot de Beauvois
Species
Scientific Name Common Name Herbarium Specimens Status Photos
Urochloa adspersa Dominican Signalgrass
Urochloa mutica Para-grass
Urochloa piligera Wattle Signalgrass
Urochloa plantaginea Alexander grass
Urochloa platyphylla Broadleaf Signal-grass
Urochloa ramosa Browntop Millet, Dixie Signalgrass
Urochloa texana Texas Millet, Texas Signalgrass
Identification Key
1.  Lowest node of inflorescence with 4-11 whorled or fascicled branches
U. maxima
1.  Lowest node of inflorescence with 1(-2) branches
2
2.  Most spikelets solitary; inflorescence branches usually 7 or fewer
3
2.  Some or most spikelets paired (except near the tips of branches); inflorescence branches usually 5 or more
9
3.  Lower glume 5-7-veined; glumes scarcely separated by a rachilla <0.3 mm long
4
3.  Lower glume 9-11-veined; glumes separated by a rachilla 0.3-0.5 mm long
5
4.  Sheath and pedicels glabrate, or pedicel with 1-2 hairs; spikelets 1.4-1.7 mm wide
U. arrecta
4.  Sheath and pedicels usually pilose; spikelets 1.8-2.3 mm wide
U. platyphylla
5.  Upper glume glabrate
6
5.  Upper glume pubescent
7
6.  Base of the blade subcordate, not clasping the stem; spikelets 3-4.5 mm long
U. distachya
6.  Base of the blade cordate, clasping the stem; spikelets 4-6 mm long
U. plantaginea
7.  Leaf blade and sheath glabrate; lower glume 3.3-5.3 mm long
U. humidicola
7.  Leaf blade and sheath pilose; lower glume 1.8-3.3 mm long
8
8.  Internodes pilose, especially below the node; spikelets 4.4-4.8(-6) mm long
U. brizantha
8.  Internodes glabrate; spikelets 3.8-4.3(-4.9) mm long
U. piligera
9.  Spikelets 4.8-6 mm long
U. texana
9.  Spikelets 2.-4.2 mm long
10
10.  Inflorescence branches densely pilose, with papillose-based trichomes
U. arizonica
10.  Inflorescence branches glabrous to sparsely pilose, hairs not or rarely papillose-based
11
11.  Upper glume with conspicuous cross-venation throughout its length
U. fusca var. reticulata
11.  Upper glume without cross-venation or only in the distal half of the glume
12
12.  Plant usually sprawling, spreading and rooting at the lower nodes separated by elongate internodes; nodes often villous; primary inflorescence branches flat and winged to slightly triquetrous
U. mutica
12.  Plant cespitose, shortly sprawling, or occasionally sprawling with elongate internodes; nodes glabrous to pubescent; primary inflorescence branches triquetrous
13
13.  Leaf blade edge smooth to faintly scabrous; spikelets abruptly acuminate at the apex
U. adspersa
13.  Leaf blade edge scabrous; spikelets shortly-mucronate or shortly-apiculate at the apex
U. ramosa
Genus Synonyms
Synonym Full Citation Basionym Type
No synonyms found.