Muhlenbergia jonesii

(Vasey) Hitchc.
Common names: Modoc muhly
Endemic
Treatment appears in FNA Volume 25. Treatment on page 183.

Plants perennial; tightly cespitose, not rhizomatous. Culms 18-50 cm, erect, rounded near the base; internodes glabrous. Sheaths glabrous, bases becoming flattened and papery, lower sheaths longer than the internodes; ligules 2-5 mm, membranous, acute to acuminate; blades (5) 6-12 cm long, 1-2.5 mm wide, flat, becoming loosely involute to subfiliform, scabrous abaxially, hirsute adaxially, apices not sharp. Panicles 4-15 cm long, 1.5-4 cm wide, not dense; primary branches 0.5-5 cm, appressed or diverging up to 40° from the rachises; pedicels 0.5-6 mm, flattened, scabrous. Spikelets 2.8-3.5 mm. Glumes subequal, 0.6-1.8 mm, scabridulous distally, truncate to obtuse, unawned; lower glumes 1-veined; upper glumes 3-veined, 3-toothed, often erose; lemmas 2.8-3.5 mm, lanceolate, loosely pubescent on the basal 1/3 of the midveins and margins, hairs to 0.6 mm, apices scabridulous, acute, mucronate, mucros shorter than 1 mm; paleas 2.8-3.5 mm, lanceolate, acute; anthers 1.4-2.3 mm, purple. Caryopses 1.6-1.8 mm, fusiform, light-brown. 2n = 20.

Discussion

Muhlenbergia jonesii is endemic to northern California. It grows on open slopes, pumice flats, and in openings in pine forests, at elevations of 1130-2130 m.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Muhlenbergia jonesii"
olivaceous +, yellow +, orange +  and purple +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
awned +  and entire +
scabridulous +
Mucronate (?) +, Acute (?) +  and Not sharp (?) +
Paul M. Peterson +
(Vasey) Hitchc. +
1 (?) +  and 3 (?) +
sinuous +, flexuous +  and straight +
multiple +, , +  and single +
curled +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
flattened +
swelling +
not pseudopetiolate +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
becoming loosely involute +  and subfiliform +
1mm;2.5mm +
spikelike +
with hairs +  and glabrous +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Modoc muhly +
rounded +
18 cm180 mm <br />0.18 m <br /> (50 cm500 mm <br />0.5 m <br />) +
not waisted +
capillary +
pistillate +  and staminate +
bisexual +  and fertile +
round +  and compressed +
reduced +
(0)1(2-3)-veined +
shorter or longer +
subtending +
scabridulous +
truncate +  and obtuse +
subequal +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
uncinate +
0 cm0 mm <br />0 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
not absent +
lanceolate +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
acute +  and acuminate +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
membranous +
inconspicuous +
1 cm10 mm <br />0.01 m <br /> (?) +
concealed +  and prominent +
2 +  and 1 +
acute +  and lanceolate +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
4cm +  and 15cm +
cleistogamous +
spikelike +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
flattened +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
dry +  and fleshy +
diverging;appressed +
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 m <br />) +
spikelike +
1 +  and 60 +
compressed +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Muhlenbergia jonesii +
Muhlenbergia +
species +
membranous +
shorter than to longer than the florets +
7 +  and 13 +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +