Lamarckia

Moench
Treatment appears in FNA Volume 24. Treatment on page 484.

Plants annual; tufted. Culms 5-40 cm, erect or decumbent at the base, glabrous. Sheaths open for at least 1/3 their length, glabrous, margins membranous and continuous with the ligules; auricles absent; ligules membranous, acute, glabrous, apices somewhat erose; blades flat, glabrous. Inflorescences panicles, dense, secund, golden-yellow to purplish; primary branches appressed to the rachis; secondary branches capillary, smooth, glabrous, flexuous, terminating in 1-4 fascicles of pedicellate spikelets, strongly bent below the junction with the fascicle base; pedicels of spikelets in each fascicle fused at the base, strigose. Spikelets dimorphic, the terminal spikelet of each fascicle fertile, the others sterile; disarticulation at the base of the fused pedicels. Fertile spikelets terete to somewhat laterally compressed, with 2 florets, 1 bisexual, the other a rudiment, borne on long rachilla internodes; calluses short, blunt, glabrous; glumes narrow, acuminate or short-awned, 1-veined; bisexual lemmas scarcely veined, each with a delicate, straight, subapical awn; paleas equal or subequal to the lemmas; lodicules 2, glabrous, toothed; anthers 3; ovaries glabrous; rudimentary florets highly reduced lemmas, each with a delicate, straight awn. Sterile spikelets linear, laterally compressed; florets 5-10; glumes similar to those of the fertile spikelets; lemmas imbricate, obtuse, unawned; paleas absent. Caryopses ovoid or ellipsoid, adhering to the lemmas and/or paleas. x = 7.

Distribution

Calif., Ariz., Pacific Islands (Hawaii), Tex.

Discussion

Lamarckia is a monotypic genus that has been introduced into North America from the Mediterranean and the Middle East.

Selected References

None.

Lower Taxa

"decumbent" is not a number.

... more about "Lamarckia"
membranous +  and scarious +
Lynn G. Clark +
Moench +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
cross +, linear +  and narrowly lanceolate +
spikelike +
not branching +
decumbent +  and erect +
5 cm50 mm <br />0.05 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not woody +
Calif. +, Ariz. +, Pacific Islands (Hawaii) +  and Tex. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
rudimentary +
5 +  and 10 +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
acuminate +
unequal +
uncinate +
reduced +
membranous +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
spikelike +
dry +  and fleshy +
bent +  and capillary +
1 +  and 60 +
fertile +, sterile +  and bisexual +
compressed +  and terete to somewhat +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Lamarckia +
Poaceae tribe Poeae +
membranous +
parallel +  and converging +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +