Arthraxon

P. Beauv.
Treatment appears in FNA Volume 25. Treatment on page 677.

Plants annual or perennial; scrambling. Culms 0.5-2 m, ascending to decumbent, often rooting at the nodes, branched. Leaves not aromatic; sheaths open, at least the outer margins pubescent, usually with papillose-based hairs; ligules membranous, fimbriate or ciliate; blades ovate to ovatelanceolate. Inflorescences terminal and axillary, panicles of subdigitate, often flabellate, clusters of rames; rame internodes not sulcate; disarticulation in the rames, beneath the sessile spikelets. Spikelets in heteromorphic sessile-pedicellate pairs or appearing solitary and sessile, pedicels greatly reduced and lacking spikelets. Sessile spikelets bisexual, with 2 florets; calluses absent or blunt; glumes equal or subequal; lower florets sterile, reduced to an unawned lemma; upper florets bisexual, awned (rarely unawned); anthers 2 or 3. Pedicels 0.2-3 mm, not thickened, not fused to the rame axes. Pedicellate spikelets absent or rudimentary, x = 9, 10.

Distribution

Del., W.Va., Pacific Islands (Hawaii), N.J., N.Y., Fla., Puerto Rico, Tex., La., Tenn., N.C., S.C., Pa., Va., Ind., Ohio, Ala., Miss., Ark., Ill., Ga., Mass., Md., Okla., D.C, Oreg., Mo., Kans., Ky.

Discussion

Arthraxon is a genus of seven species that are native to tropical and subtropical regions of the Eastern Hemisphere; one species is established in the Flora region.

Lower Taxa

"decumbent" is not a number."elongated" is not a number.

... more about "Arthraxon"
3 +  and 2 +
anatomy +  and kranz +
John W. Thieret +
P. Beauv. +
1 (?) +  and 3 (?) +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
pseudopetiolate +
non-radiate +  and radiate +
well-developed +
ovate +  and ovatelanceolate +
reduced +
spikelike +
branched +  and rooting +
purple +  and reddish +
ascending +  and decumbent +
50 cm500 mm <br />0.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
not woody +
Del. +, W.Va. +, Pacific Islands (Hawaii) +, N.J. +, N.Y. +, Fla. +, Puerto Rico +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Va. +, Ind. +, Ohio +, Ala. +, Miss. +, Ark. +, Ill. +, Ga. +, Mass. +, Md. +, Okla. +, D.C +, Oreg. +, Mo. +, Kans. +  and Ky. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
subequal +
papillose-based +
uncinate +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
photosynthetic +
not aromatic +
coriaceous +
ciliate +  and fimbriate +
membranous +
inconspicuous +
complex +  and simple +
concealed +  and prominent +
sessile-pedicellate +  and heteromorphic +
not fused +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
dry +  and fleshy +
elongate +
welzen1981a +
pedicellate +  and sessile +
in triplets +  and paired +
usually smaller +  and reduced +
1 (?) +  and 3 (?) +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Arthraxon +
Poaceae tribe Andropogoneae +
membranous +
sessile-pedicellate +
perennial +  and annual +
plant +  and scrambling +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +