Zyzyura H. Rob. & Pruski, 2013
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publication ID |
https://dx.doi.org/10.3897/phytokeys.20.4033 |
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persistent identifier |
https://treatment.plazi.org/id/6C9794F4-446C-9D9F-3B2A-7AB554166CAB |
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treatment provided by |
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scientific name |
Zyzyura H. Rob. & Pruski |
| status |
gen nov. |
Zyzyura H. Rob. & Pruski gen nov.
Differs from Fleischmannia by the conical and fistulose receptacle, the eximbricate rather ‘Piquerian’ involucre, the slender-based corolla with broadly campanulate limb, and elongate cells of the carpopodium.
Type.
Fleischmannia mayana Pruski.
Description.
Decumbent epilithic herbs rooting at proximal nodes, prostrate portions 5-20 cm long, with short internodes, mostly glabrous, ascending portions 15-30 cm tall, with few small hairs, with long basal internodes; stems narrowly fistulose. Leaves ( Fig. 1A View Figure 1 ) opposite, petioles mostly 3-5 mm; blades deltate in outline, mostly 4-7 mm long and wide, 3-7-lobed with sinuses 1/3-1/2 to midvein, basal margin truncate or subtruncate, triplinervate at base, margins of lobes often slightly notched, sparsely pilose adaxially, paler and hairless with crowded glandular dots abaxially. Inflorescence ( Fig. 1B View Figure 1 ) terminal on ascending portions, ascending parts not branched below, distally loosely branching with 3-10 capitula, with few minute opposite to subopposite bracteoles; peduncles mostly 0.5-1.8 cm long. Capitula discoid, broadly hemispherical, to 7 mm high and wide; involucres ( Fig. 1C View Figure 1 ) eximbricate; bracts c. 16 in mostly 2 series, subequal, obovate, with obtuse to rounded tips, chartaceous-becoming more scarious distally, bicostate proximally, few shorter outer bracts, scarcely spreading at maturity, essentially glabrous; receptacle ( Fig. 1C View Figure 1 ) high-conical, fistulose, epaleate, without evidence of fully developed florets born on distal part. Florets 20-23; corollas white, 2.2-2.3 mm long, mostly glabrous, sparse glandular dots on lobes, immediate base dilated, thickly ribbed, narrowed to a slender tube closely investing the style, limb abruptly ampliate, campanulate, lobes ( Fig. 1D View Figure 1 ) deltate, with intermarginal ribs, cells projecting at distal ends on inner and outer surface; anther collars slender, with numerous annular thickenings that do not completely obscure transverse cell walls; anther thecae ( Fig. 1E View Figure 1 ) c. 0.5 mm long; apical appendage slightly broader than long. Style base without expanded node, papillae or hairs, style appendages thickened, densely papillose. Cypsela ( Fig. 2 View Figure 2 ) 1.2-1.3 mm long, somewhat fusiform, 3-5 costate, with few scabrae on ribs; carpopodium ( Fig. 1F View Figure 1 ) broadened, with distinct projecting upper rim, cells enlarged and elongate with moderately thickened walls; pappus iniser ate ( Fig. 2 View Figure 2 ) with c. 10 persistent capillary bristles, reaching to approximately the base of corolla lobes, broadened but not contiguous at base, scabridulous, narrowed to apex. Pollen c. 18 μm in diam. in fluid.
Distribution.
The genus contains only the single species that may be endemic to the type locality in the Maya Mountains of the Cockscomb range in Belize.
Ecology.
Cited as epilithic.
Etymology.
Contrived name (no meaning).
Specimens examined.
Zyzyura mayana (Pruski) H. Rob. & Pruski, comb. nov. (IPNI ID: urn:lsid:ipni.org:names:77124264-1), basionym: Fleischmannia mayana Pruski in Pruski and Clase, Phytoneuron 2012-32: 6. 2012. Presently known only from Victoria Peak in the Cockscomb range of the Maya Mountains in Belize (Brewer & Pau 3349, holotype MO).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.