Achnopogon virgatus Maguire, Steyerm. & Wurdack
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Authority
Maguire, Bassett, et al. 1957. Botany of the Chimanta Massif - I Gran Sabana, Venezuela. Mem. New York Bot. Gard. 9 (3): 393-484.
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Family
Asteraceae
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Scientific Name
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Description
Latin Diagnosis - Frutex 0.3-0.6-metralis, caule principali cinereo erecto, 2-12 cm longo 7-12 mm diam., apice cinereo-tomentello aliter glabro, ramis lateralibus simplicibus vel interdum ramosis arcuato-adscendentibus gracilibus, 2-3 mm diam. basi ad 5 mm diam. 2-6 dm altis, cano-pubescentibus vel glabrescentibus; foliis coriaceis apice caulis principalibus vel caulium lateralium brevium rosulato-confertis sessilibus vel breviter petiolatis, laminis subtus pallido-viridibus anguste elliptico-lanceolatis vel oblanceolatis acutiusculis apiculatis vel obtusis, 2-6 cm longis 6-12 mm latis, subtus leviter penninerviis nervis lateralibus utroque latere plerumque 10-12 valde reticulato-venosis supra nervis obscuris vel nullis, irregulariter pilosis vel glabrescentibus, costa media prominenti, supra canaliculata subtus prominenti, marginibus valde nervatis, foliis caulium floriferum lateralium erecto-adscendentibus alternis plerumque breviter petiolatis, petiolis 3-5 mm longis 1.5-2 mm latis, laminis oblongo-lanceolatis vel elliptico-oblongis acutis vel acuminatis apiculatis, 1.5-2.5 cm longis 4-9 mm latis, subtus leviter penninerviis nervis lateralibus utroque latere 4-7 valde reticulato-venosis supra nervis obscuris vel nullis dense vel parce pilosis; inflorescentiis lateralibus in axillis foliorum superiorum in cymis dispositis breviter pedunculatis; capitulis 2-3 in cyma, campanulato-cylindricis, 10-15 mm longis 4-5 mm latis, homogamis 4-6-floris; phyllariis 15-20, firme chartaceis vel apice subcoriaceis ca 5-seriatis aequaliter gradatis adpressis, 5-9-striatis, extremis ovatis vel lanceolatis acutis, 3-5 mm longis 0.8-1.6 mm latis, extus bmnino cano-hirtellis intus glabris, medianis oblanceolatis vel obovatis acutis, 6-7 mm longis 2-3 mm latis, extus apice et parte suprema cano-barbatis pilis erectis infra medium intusque glabris, intimis supremisque oblanceolatis acutis, 9-10.5 mm longis 1.5-2.0 mm latis; receptaculo hemisphaerico, 0.6-0.9 mm diam., apice hirsutis pilis erectis 2-4 mm longis; corollis bilabiatis, 8.0-8.5 mm longis, tubo cylindrico, 3-3.5 mm longo 0.4-1.5 mm diam., extus supra basitn minute puberulo, limbo 5 mm longo, lobo posteriore (exteriore) intus albido "extus albido-lilacino apice purpureo, 4-5 mm longo, 3-dentato lobis ovatis obtusis 0.2-0.3 mm longis, lobo anteriore (interiore) 2-partito, lobis albidis ligulatis acutiusculis valde revolutis, 3-4 mm longis 0.5-0.6 mm latis; filamentis ca. 0.5 mm longis, in orificio tubi affixis; antheris vinaceis, 3.75-4.0 mm longis, appendicibus terminalibus ovatis subacutis, 0.5-0.6 mm longis, caudicibus simplicibus non sagittatis linearibus subacutis, 1.0-1.2 mm longis, liberis; stylo vix vel non exserto ramulis recurvatis late obtusis truncatis 1.2-1.4 mm longis, dorso unilobato, parte stigmatica 0.2-0.3 mm projecta; pappo stramineo vel rufescenti-stramineo curvato, 6.0-6.5 mm longo, setis numerosis ca. 5-seriatis minute adscendenti-barbellatis; achaeniis stramineis fusiformibus, 5-6 mm longis 1.0-1.5 mm diam., 10-nervatis glabris, annulo brevissimo, corona perbrevi, minute 5-lobata.
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Discussion
TYPE: savanna below summit of western escarpment, Torono-tepuf, Chimanta Massif, Bolivar, Venezuela, 2090 m alt., February 9, 1955, Julian A. Steyermdrk & John J. Wurdack 681 (holotype F, isotype NY). Paratypes: prominent exposed sandstone formations around swampy savannas on plateau of southeast-facing upper shoulder of Apacara-tepui, Chimanta Massif, 2100 m alt., June 20, 1953, Steyermark 75770; rocky and swampy savanna between west and east branches of headwaters of Rio Tirica, Central Section, Chimanta Massif, 2120-2210 m alt., February 11, 1955, Steyermark & Wurdack 742; rocky open places on large boulders bordering zanjones in valley of Rio Tirica above Summit Camp, Central Section, Chimanta Massif, 1940 m alt., February 7, 1955, Steyermark & Wurdack 571.