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beak panicgrass

Mohave witchgrass, Mojave panicgrass

Habit Plants perennial; conspicuously rhizomatous, rhizomes short or elongate, stout, scaly. Plants annual.
Culms

30-130 cm, terete to slightly compressed.

2-8 cm, erect-spreading;

nodes 1-2, hispid;

internodes pilose, hairs papillose-based.

Sheaths

laterally compressed, glabrous or sparsely to densely pilose or villous, especially at the summit;

ligules less than 0.5 mm, membranous, erose, often brownish;

blades 10-50 cm long, 4-12 mm wide, erect, adaxial surfaces pilose at least basally, glabrous or pilose abaxially.

rounded, much longer than the internodes, with prominent veins, hispid, hairs papillose-based;

ligules 0.2-0.4 mm, membranous, ciliate;

blades 1-4 cm long, 1-3 mm wide, flat or involute apically, glabrous basally, margins ciliate, cilia papillose-based.

Panicles

10-40 cm, 1/4 - 2/3 as wide as long, well-exserted at anthesis;

branches relatively few, stiffly spreading or ascending; ultimate branchlets 1-sided;

pedicels 0.1-3 mm, scabridulous to scabrous, appressed.

congested, partially included in the sheaths, less than 1.5 times longer than wide;

branches ascending, narrow;

primary branches appressed to the main axes, secondary branches and pedicels attached to the distal 2/3;

pedicels appressed, 1-2 mm.

Spikelets

2.3-3.9 mm, narrowly ellipsoid to ovoid, usually subsessile, usually pale to yellowish-green, glabrous, often falcate and gaping at the apices, rarely lanceolate, densely crowded on short, appressed branchlets, set obliquely on short pedicels.

2-2.2 mm long, 1-1.3 mm wide, plump-ellipsoid, glabrous.

Lower glumes

A-A as long as the spikelets, 3-veined, keels scabrous, apices acute;

upper glumes and lower lemmas subequal, keeled, beaked, usually gaping at the apices;

lower florets sterile;

lower paleas subequal to the lower lemmas;

upper florets 1.5-2.2 mm long, about 1 mm wide, 2/5 – 3/4 as long as the spikelets, apices with a tuft of minute, thick hairs;

upper lemmas thick, stiff, clasping the upper paleas throughout their length.

1.2-1.3 mm, acute to attenuate;

upper glumes and lower lemmas 2-2.2 mm, 7-9-veined, apices purplish, acute;

lower florets sterile;

lower paleas 0.2-0.4 mm;

upper florets 1.4-1.8 mm long, about 1 mm wide, broadly ovoid.

2n

= 18, 36.

Panicum anceps

Panicum mohavense

Distribution
from FNA
AL; AR; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WV
[WildflowerSearch map]
from FNA
AZ; NM
[BONAP county map]
Discussion

Panicum anceps grows in low, moist, primarily sandy areas, pine savannahs, the borders of flood-plain swamps, mesic woodlands, roadsides, and upland pine-hardwood forests. It is restricted to the United States.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Panicum mohavense is known only from arid limestone terraces in Arizona and New Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Spikelets 2.7-3.9 mm long, often clearly falcate; rhizomes relatively short and stout
subsp. anceps
1. Spikelets 2.3-2.8 mm long, not clearly falcate; rhizomes relatively long and slender
subsp. rhizomatum
Source FNA vol. 25, p. 478. FNA vol. 25, p. 462.
Parent taxa Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Agrostoidea > sect. Agrostoidea Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Panicum > sect. Panicum
Sibling taxa
P. amarum, P. antidotale, P. bergii, P. bisulcatum, P. brachyanthum, P. bulbosum, P. capillare, P. capillarioides, P. coloratum, P. dichotomiflorum, P. diffusum, P. flexile, P. ghiesbreghtii, P. gymnocarpon, P. hallii, P. hemitomon, P. hirsutum, P. hirticaule, P. lacustre, P. miliaceum, P. mohavense, P. obtusum, P. paludosum, P. philadelphicum, P. plenum, P. psilopodium, P. repens, P. rigidulum, P. tenerum, P. trichoides, P. urvilleanum, P. verrucosum, P. virgatum
P. amarum, P. anceps, P. antidotale, P. bergii, P. bisulcatum, P. brachyanthum, P. bulbosum, P. capillare, P. capillarioides, P. coloratum, P. dichotomiflorum, P. diffusum, P. flexile, P. ghiesbreghtii, P. gymnocarpon, P. hallii, P. hemitomon, P. hirsutum, P. hirticaule, P. lacustre, P. miliaceum, P. obtusum, P. paludosum, P. philadelphicum, P. plenum, P. psilopodium, P. repens, P. rigidulum, P. tenerum, P. trichoides, P. urvilleanum, P. verrucosum, P. virgatum
Subordinate taxa
P. anceps subsp. anceps, P. anceps subsp. rhizomatum
Name authority Michx. Reeder
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