Poa hartzii

Gand.
Common names: Hartz's bluegrass
Treatment appears in FNA Volume 24. Treatment on page 589.

Plants perennial; not glaucous; densely to loosely tufted, not rhizomatous,occasionally weakly stoloniferous. Basal branching extra and intravaginal. Culms 10-33 (45) cm, usually decumbent, terete; nodes terete, 0 (1) exserted. Sheaths closed for 1/7 – 1/5 (1/3) their length, terete, usually lustrous, bases of basal sheaths glabrous; ligules (1.5) 2-7 mm, smooth or sparsely scabrous, margins usually decurrent, apices obtuse to acuminate; innovation blades similar in texture and shape to those of the culms; cauline blades 2-9 cm, gradually increasing or decreasing in length upwards, 1.5-3 mm wide, folded to involute, moderately thick, soft, abaxial surfaces smooth, adaxial surfaces smooth or somewhat scabrous, usually glabrous, infrequently sparsely hispidulous, apices narrowly prow-shaped. Panicles 2.5-6 (12) cm, erect, narrowly lanceolate, contracted or narrowly ovate in some bulbiferous plants, moderately congested, with 7-40 spikelets; nodes with (1) 2 (4) branches; branches 1-3 cm, erect to ascending, straight, sulcate, smooth or sparsely to moderately scabrous, with 1-10 spikelets in the distal 1/3 – 2/3. Spikelets 4.8-7.4 mm, lengths 3.5-4 times widths, lanceolate, weakly laterally compressed, sometimes bulbiferous, lustrous; florets (2) 3-5 (6), normal or bulb-forming; rachilla internodes 0.8-2 mm, smooth, sometimes sparsely hispidulous. Glumes mostly broadly scarious, somewhat lustrous, keels indistinct, smooth or sparsely scabrous distally; lower glumes 3-veined; upper glumes frequently exceeding the lowest lemmas; calluses glabrous or with a crown of hairs, hairs to 2 mm; lemmas (3.3) 3.5-7 mm, lanceolate, usually weakly keeled, more or less evenly and somewhat loosely to densely hairy over the proximal 1/3-1/2, hairs usually longer than 0.5 mm, sparsely scabrous in the middle 1/3, smooth distally, lateral-veins obscure, margins weakly inrolled, broadly scarious, glabrous, apices long-scarious, acute to shortly obtuse, often erose, often bronze-colored below the apices; palea keels sparsely scabrous, softly puberulent at midlength, intercostal regions softly puberulent; anthers usually all aborted late in development and 0.8-1.8 mm, infrequently well developed and 2-2.8 mm. 2n = 63, 70.

Distribution

Alaska, Greenland, N.W.T., Nunavut, Que.

Discussion

Poa hartzii grows only in the high arctic. It generally grows on open ground, on sandy or clayey soils, or on slumping slopes of old marine terraces. It carries two chloroplast genomes within its populations; one of these links it to P. secunda (p. 586) and P. ammophila (see next), the other to P. glauca (p. 576). Morphologically, it is closest to P. secunda and P. ammophila.

Selected References

None.

Key

1 Spikelets bulbiferous Poa hartzii subsp. vrangelica
1 Spikelets not bulbiferous. > 2
2 Lemmas 5.5-7 mm long; anthers well developed, 2-2.8 mm long Poa hartzii subsp. alaskana
2 Lemmas 3.3-5.4 mm long; anthers usually aborted and shorter than 1.5 mm Poa hartzii subsp. hartzii

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

... more about "Poa hartzii"
membranous +  and scarious +
hispidulous +  and glabrous +
5 cm50 mm <br />0.05 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
bronze-colored +
acute +  and shortly obtuse +
long-scarious +
Robert J. Soreng +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
strigose +  and glabrous +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
persisting +
not evident +
involute +, folded +  and flat +
erect;ascending +
hispidulous +, glabrous +, smooth or +  and sparsely densely scabrous +
angled +  and terete +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
with a crown +  and glabrous +
compressed +  and terete +
folded +  and involute +
2 cm20 mm <br />0.02 m <br /> (9 cm90 mm <br />0.09 m <br />) +
Hartz's bluegrass +
unbranched +  and hollow +
ascending +  and erect +
10 cm100 mm <br />0.1 m <br /> (33 cm330 mm <br />0.33 m <br />) +
not woody +
Alaska +, Greenland +, N.W.T. +, Nunavut +  and Que. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
3 +  and 5 +
compressed +
reduced +
bulb-forming +  and normal +
1-3(5)-veined +
shorter or longer +
subtending +
lanceolate +  and broadly lanceolate +
unequal +
distributed +
uncinate +
0.5 cm5 mm <br />0.005 m <br /> (0 cm0 mm <br />0 m <br />) +
0 +  and 1/6 +
Oval (?) +  and Round (?) +
milky white +  and slightly greenish +
indistinct +
5(7-11)-veined +
keeled +  and lanceolate +
subequal +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
membranous +
erose +  and entire +
white +  and milky white or hyaline +
ciliolate +  and smooth +
lacerate +, truncate +  and acuminate +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
membranous +
inconspicuous +
lobed +  and lanceolate +
milky white +  and slightly greenish +
decurrent +
concealed +  and prominent +
0 +  and 5 +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
12 cm120 mm <br />0.12 m <br /> (?) +
ovate +  and lanceolate +
2.5 cm25 mm <br />0.025 m <br /> (6 cm60 mm <br />0.06 m <br />) +
dry +  and fleshy +
1 +  and 10 +
compressed +  and lanceolate +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.74 cm7.4 mm <br />0.0074 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Poa hartzii +
Poa subsect. Secundae +
species +
membranous +
parallel +  and converging +
branching +, stoloniferous +  and not rhizomatous +
aquatic +  and terrestrial +