familyPoaceae
subfamilyPoaceae subfam. Chloridoideae
tribePoaceae tribe Cynodonteae
genusBouteloua
subgenusBouteloua subg. Chondrosum
speciesBouteloua barbata
varietyBouteloua barbata var. rothrockii

Bouteloua barbata var. rothrockii

(Vasey) Gould
J.K. Wipff
Common names: Rothrock's grama
Synonyms: Bouteloua rothrockii
Treatment appears in FNA Volume 25. Treatment on page 265.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché, Linda A. Vorobik

Copyright: Utah State University

Plants short-lived perennials; not stoloniferous. Culms 25-60 (75) cm, stiffly erect or slightly geniculate-spreading basally; ligules 0.1-0.5 mm; blades 6-10 cm long, 1-4 mm wide. Panicles (3.5) 5-25 cm, with 3-8 branches; branches 15-30 mm, scabrous, with 35-50 (55) spikelets. 2n = 40.

Discussion

Bouteloua barbata var. rothrockii grows on dry slopes and sandy flats, mostly at 750-1700 m. It grows throughout the southwestern United States and Mexico, sometimes covering large areas. It used to be the most important forage grass in southern Arizona and neighboring regions.

Bouteloua barbata var. rothrockii resembles B. parryi var. parryi, but can be easily distinguished from that taxon by the lack of papillose-based hairs on the keels of its upper glumes.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Bouteloua barbata var. rothrockii"
RDF feed
2n chromosome quantity
40 +
Abaxial ligule presence
absent +
Abaxial ligule quantity
common +
Adaxial cell presence
absent +
Adaxial cell shape
bulliform +
Adaxial cell structure in adjective form
stomatal +
Adaxial ligule architecture or pubescence or shape
ciliate +
Adaxial ligule length or size
longer +
Adaxial ligule presence
absent +
Adaxial ligule texture
membranous +
Adaxial surface pubescence
pubescent +
Anther quantity
1 +  and 3 +
Anther some measurement
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Apex pubescence
puberulent +  and glabrous +
Apex shape
mucronate +, acuminate +  and bilobed +
Apical cell height or length or size
short +
Apical cell width
Wide (?) +
Arm cell anatomy
kranz +
Arm cell presence
absent +
Auricle presence
absent +
Author
J.K. Wipff +
Authority
(Vasey) Gould +
Awn atypical quantity
1 (?) +  and 3 (?) +
Awn development
well-developed +
Awn height or length or size
short +
Awn orientation
arising +
Awn quantity
3 +
Awn some measurement
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Back shape
keeled +  and rounded +
Base architecture
pseudopetiolate +  and branching +
Base arrangement
close +
Base fusion
not fused +
Base position
intravaginal +, extravaginal +, branching +  and basal +
Base size
swelling +
Base texture
membranous +
Base width
thick +
Blade architecture
not pseudopetiolate +
Blade architecture or arrangement
radiate +
Blade length
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Blade position
adaxial +
Blade pubescence
pubescent +  and glabrous +
Blade shape
usually linear +  and lanceolate occasionally ovate +
Blade width
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Branch architecture
subdigitate +  and digitate +
Branch architecture or arrangement or growth form
solitary +
Branch arrangement
racemose +
Branch atypical quantity
11 (?) +  and 2 (?) +
Branch atypical some measurement
75 cm750 mm <br />0.75 m <br /> (?) +
Branch course
straight +  and arcuate +
Branch duration
persistent +
Branch pubescence
glabrous +
Branch pubescence or relief
scabrous +
Branch quantity
3;8 +
Branch relief
scabridulous +
Branch shape
spikelike +
Branch some measurement
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Branch texture
not woody +
Caryopsis some measurement
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Cell shape
triangular +  and dome--shaped +
Cilium architecture or pubescence or shape
ciliate +
Cilium length or size
sometimes longer +
Cilium texture
membranous +
Column quantity
single +
Common name
Rothrock's grama +
Culm architecture
rooting +
Culm architecture or arrangement or growth form
solitary +
Culm atypical some measurement
75 +
Culm duration
annual +
Culm growth form
climbing +
Culm growth form or location
floating +
Culm growth form or orientation
prostrate +
Culm orientation
geniculate-spreading +  and erect +
Culm some measurement
25 cm250 mm <br />0.25 m <br /> (60 cm600 mm <br />0.6 m <br />) +
Culm texture
not woody +
Distal floret architecture
staminate +
Distal floret reproduction
sterile +
Distal floret size
reduced +
Distal floret variability
varying +
Distribution
Md. +, Kans. +, Okla. +, Colo. +, N.Mex. +, Tex. +, Utah +, Calif. +, Mont. +, Ariz. +, Oreg. +  and Nev. +
Embryo architecture or shape
cleft +
Embryo presence
absent +
Embryo shape
not waisted +
Embryo size
large +
Endosperm texture
hard +
Filament shape
capillary +
Floret architecture
pistillate +  and staminate +
Floret arrangement
adjacent +
Floret atypical quantity
3 +
Floret height or length or size
shorter +
Floret lemma architecture
3-veined +
Floret lemma architecture or shape
bilobed +  and entire +
Floret lemma shape
4-lobed +  and trilobed +
Floret length or size
sometimes longer +
Floret palea architecture
2-veined +
Floret prominence
rudimentary +
Floret quantity
2 +  and 1 +
Floret reproduction
bisexual +
Floret shape
flabellate +  and 2-lobed +
Floret size
reduced +
Floret some measurement
1.5mm +  and 4mm +
Fusoid cell presence
absent +
Genus quantity
1 +
Glume architecture
1-veined +
Glume architecture or shape
awned +
Glume height or length or size
shorter +
Glume length or size
shorter or longer +
Glume position
subtending +
Glume pubescence
glabrous +
Glume quantity
both +  and 1 +
Glume relief
scabridulous +
Glume shape
acuminate +  and acute +
Glume size
unequal +
Group quantity
3 +
Hair architecture
not papillose-based +  and papillose-based +
Hair density
dense +
Hair length or size
long +
Hair quantity
few +
Hair relief
coarse +
Hair shape
uncinate +
Hilum arrangement or course or shape
linear +
Hilum coloration or relief
punctate +
Hilum height or length or size
short +
Illustration
Present +
Illustration copyright
Utah State University +
Illustrator
Linda A. Vorobik +  and Cindy Roché +
Inflorescence architecture
pistillate +
Inflorescence arrangement
paniculate +  and racemose +
Inflorescence fusion
distinct +
Inflorescence position
axillary +
Inflorescence position or structure subtype
terminal +
Internode architecture
hollow +  and solid +
Internode shape
elongate +
Layer presence
not absent +
Leaf arrangement
distichous +
Leaf margin arrangement
Overlapping (?) +
Leaf position
cauline +  and basal +
Lemma architecture
5-veined +, 7-13-veined +  and 1-3-veined +
Lemma architecture or shape
awned +
Ligule architecture or pubescence or shape
ciliate +
Ligule length or size
sometimes longer +
Ligule presence
absent +
Ligule some measurement
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Ligule texture
membranous +
Lobe architecture or shape
3-awned +
Lobe quantity
2 (?) +
Lobe shape
rounded +
Lobe texture
membranous +
Lodicule presence
absent +
Lodicule prominence
inconspicuous +
Lodicule quantity
2 +
Lower glume height or length or size
usually shorter +
Lower glume some measurement
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Lower internode pubescence
glabrous +
Lowest floret size
sterile +
Lowest lemma architecture or shape
3-awned +
Lowest lemma pubescence
pilose +
Lowest lemma some measurement
0.17 cm1.7 mm <br />0.0017 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Lowest palea architecture or shape
2-awned +
Lowest palea pubescence
pubescent +
Lowest palea shape
4-lobed +
Lowest palea some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Marginal hair arrangement
adjacent +
Marginal hair fragility
stiff +
Marginal hair relief
coarse +
Microhair presence
absent +
Midrib architecture
simple +
Node prominence
concealed +  and prominent +
Number of lower taxa
0 +
Other quantity
2 +  and 1 +
Ovary pubescence
glabrous +
Palea shape
keeled +
Panicle architecture
simple +
Panicle atypical some measurement
3.5 cm35 mm <br />0.035 m <br /> (?) +
Panicle branch duration
persistent +
Panicle branch height or length or size
short +
Panicle branch quantity
1 (20) +
Panicle some measurement
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
Pericarp architecture or fragility
loose +
Pericarp arrangement
separating +
Pericarp condition or texture
dry +
Pericarp fusion
free +
Pericarp texture
dry +  and fleshy +
Raceme shape
spikelike +
Rachilla segment position
subtending +
Rachis prominence
evident +
Rachis shape
elongate +
Reference
None +
Row quantity
2 +
Scale shape
flabellate +
Sheath architecture
open +
Sheath condition
closed +
Sheath pubescence
glabrous +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V25/V25 895.xml +
Spikelet architecture
sessile +  and subsessile +
Spikelet architecture or arrangement or growth form
solitary +
Spikelet arrangement
imbricate +
Spikelet atypical quantity
55 (?) +
Spikelet density
dense +
Spikelet development
well-developed +
Spikelet fixation
attached +
Spikelet fixation or orientation
appressed +
Spikelet position or shape
distal +
Spikelet presence
absent +
Spikelet quantity
35 +  and 50 +
Spikelet reproduction
bisexual +
Spikelet shape
pectinate +
Spikelet some measurement
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Stamen quantity
1 +  and 3 +
Starch-grain architecture
compound +  and simple +
Starch-grain presence
absent +
Style-branch atypical quantity
4 +  and 1 +
Style-branch quantity
2 (?) +  and 3 (?) +
Style arrangement
separate +
Style quantity
2 +
Synonyms
Bouteloua rothrockii +
Taxon architecture
staminate +
Taxon family
Poaceae +
Taxon name
Bouteloua barbata var. rothrockii +
Taxon parent
Bouteloua barbata +
Taxon rank
variety +
Taxon reproduction
dioecious +
Tissue coloration
hyaline +
Tissue texture
membranous +
Tuft density
dense +
Upper glume pubescence
strigose +, scabrous +  and glabrous +
Upper glume some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Vein architecture
excurrent +
Vein presence
absent +
Vein quantity
7 (?) +  and 13 (?) +
Vein size
extended +
Volume
Volume 25 +
Whole-organism duration
perennial +  and short-lived +
Whole organism architecture
not stoloniferous +
Whole organism arrangement or pubescence
tufted +
Whole organism duration
short-lived +  and annual +
Whole organism growth form
plant +
Whole organism growth form or habitat
aquatic +  and terrestrial +
Whole organism reproduction
synoecious +
Whole organism variability
various +
X chromosome atypical quantity
12 +
X chromosome quantity
10 +