Poa pringlei

Scribn.
Common names: Pringle's bluegrass
Endemic
Treatment appears in FNA Volume 24. Treatment on page 564.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants perennial; densely tufted, not stoloniferous, not rhizomatous. Basal branching intravaginal. Culms 5-35 cm tall, 0.5-0.9 mm thick, erect or the bases decumbent, with 0 (1) exserted nodes. Sheaths closed for 1/7 - 1/3 their length, terete, smooth or sparsely scabrous, glabrous, bases of basal sheaths glabrous, distal sheath lengths 2-4 times blade lengths; collar margins smooth or scabrous to hispidulous; ligules of cauline leaves 1-6 mm, colorless, translucent, smooth or scabrous, truncate to acute, ligules of the innovations 1-2.5 mm; innovation blades similar to the cauline blades, 1.5-3 mm wide, involute, thick, frequently somewhat arcuate, abaxial surfaces smooth, adaxial surfaces densely scabrous or hispidulous; cauline blades becoming only slightly shorter distally, 1.5-3 mm wide, involute, moderately thick, soft to moderately firm, abaxial surfaces smooth, apices narrowly prow-shaped. Panicles 1-6 cm, erect, narrowly lanceoloid to ovoid, moderately congested, with 6-20 (25) spikelets; nodes with 1-2 branches; branches 0.5-1.5 (2) cm, erect, moderately stout, terete or weakly angled, angles smooth to fairly densely scabrous, with 1-3 spikelets. Spikelets 6-8 (12) mm, lengths to 3.5 times widths, broadly lanceolate, laterally compressed, not sexually dimorphic, lustrous; florets 2-5; rachilla internodes smooth. Glumes subequal, isomorphic, lanceolate to broadly lanceolate, thin, lustrous, distinctly keeled, keels smooth or sparsely scabrous; lower glumes shorter than the adjacent lemmas, 3-veined; calluses glabrous; lemmas 5-8 mm, lanceolate, distinctly keeled, thinly membranous, smooth or sparsely finely scabrous, glabrous, lateral-veins moderately prominent, margins glabrous, apices acute; palea keels coarsely scabrous; anthers vestigial (0.1-0.2 mm) or 2-4 mm. 2n = unknown.

Discussion

Poa pringlei grows on rocky subalpine and alpine slopes in Oregon and California. Sexual populations, with approximately equal numbers of pistillate and staminate plants, are confined to the Klamath-Siskiyou region; Sierra Nevada populations are pistillate and apomictic. Hitchock (1951) included P. cusickii subsp. pallida (p. 560), P. keckii (p. 584), and P. suksdorfii (p. 584) in P. pringlei; the illustration (Fig. 171) is of P. cuscikii subsp. pallida.

Hybrids otPoa pringlei with P. cusickii (p. 560) have been found on Mount Shasta, California, Mount Rose, Nevada, and near Crater Lake, Oregon. Poa pringlei differs from P. curtifolia (p. 589) in being dioecious and in having blades that are involute, soft to moderately firm, and abaxially pubescent.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.No values specified."decumbent" is not a number."thick" is not a number.

... more about "Poa pringlei"
membranous +  and scarious +
hispidulous +  and scabrous +
5 cm50 mm <br />0.05 m <br /> (?) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
scarious-hyaline +
acute +  and prow--shaped +
Robert J. Soreng +
Scribn. +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
strigose +  and glabrous +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
involute +, folded +  and flat +
2 cm20 mm <br />0.02 m <br /> (?) +
hispidulous +, glabrous +, scabrous +  and smooth +
angled +  and terete +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
compressed +  and terete +
prow--shaped +, involute +, folded +  and flat +
soft +  and moderately firm +
Pringle's bluegrass +
unbranched +  and hollow +
5 cm50 mm <br />0.05 m <br /> (35 cm350 mm <br />0.35 m <br />) +
compressed +  and terete +
5 cm50 mm <br />0.05 m <br /> (60 cm600 mm <br />0.6 m <br />) +
not woody +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Calif. +, Oreg. +  and Nev. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
2 +  and 5 +
compressed +
reduced +
2mm +  and 10mm +
1-3(5)-veined +
shorter or longer +
subtending +
keeled +, lanceolate +  and broadly lanceolate +
subequal +
distributed +
uncinate +
0.1 cm1 mm <br />0.001 m <br /> (?) +
0 +  and 1/6 +
Oval (?) +  and Round (?) +
milky white +  and slightly greenish +
hairy +  and glabrous +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
5(7-11)-veined +
glabrous +, scabrous +  and smooth +
keeled +  and lanceolate +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
membranous +
erose +  and entire +
colorless +  and milky white +
ciliolate +  and glabrous +
truncate +  and acuminate +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
membranous +
inconspicuous +
lobed +  and lanceolate +
milky white +  and slightly greenish +
concealed +  and prominent +
0 +  and 5 +
compressed +  and terete +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
narrowly lanceoloid +  and ovoid +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
dry +  and fleshy +
hairy +, glabrous +, scabrous +  and smooth +
glabrous +, scabrous +  and smooth +
rhizomatous +  and stoloniferous +
not bulbiferous +
compressed +  and lanceolate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Poa pringlei +
Poa subsect. Epiles +
species +
membranous +
5-veined +  and 3-veined +
parallel +  and converging +
branching +, not rhizomatous +  and not stoloniferous +
aquatic +  and terrestrial +