Ageratum microcarpum (Benth. ex Benth.) Hemsl.


Cite taxon page as 'WFO (2020): Ageratum microcarpum (Benth. ex Benth.) Hemsl. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000072527. Accessed on: 02 Jul 2020'

General Information

Annual or short-lived perennial erect herbs or subshrubs to 1.2 m tall, with few to many branches; stems becoming brownish to slightly reddish, terete,

  • Provided by: [B].Flora de Panama
    • Source: [
    • 1
    • ]. 

    slightly striate, sometimes broadly fistulose, sparsely to densely long-pilose, sometimes also slightly puberulous. Leaves mostly opposite; blades ovate, to 7 cm long and 4.5 cm wide, the base usually truncate to slightly cordate, strongly trinervate from the base, the margins closely serrate to serrate-crenate, the apex short-acute to slightly acuminate, the upper surface dull green, pilose with numerous long hairs, sometimes also sparsely puberulous, the lower surface slightly paler with glandular punctations and numerous long slender hairs; petioles to 3.5 cm long. Inflorescence corymbose to slightly cymose with compact corymbose branches, the branches densely whitish-puberulous to hirtellous, the ultimate branches 3-8 mm and rarely to 17 mm long. Heads 4-5 mm high with ca. 60-75 florets; involucral bracts ca. 25, eximbricate, in 2 series, ca. 4 mm long, oblong- lanceolate, prominently bicostate, with prominent often antrorsely lacerate scarious margins, the apex sharply acute, not scarious near tip, the outer surface pilose to hirtellous with numerous slender hairs; receptacle naked; corolla and style branches usually bluish; corolla ca. 2.3 mm long, the tube slender, ca. 1 mm long wvith numerous small but distinct stipitate glands, the limb and the upper tube usually with a few short hairs, the lobes ca. 0.3 mm long with many papillae inside and near the tip outside, a few short hairs on outer surface; style branches slightly enlarged distally and usually very prominent, papillae small and somewhat pointed. Achenes ca. 1.2 mm long, sparsely scabrid to essentially glabrous; carpopodium somewhat asymmetrical; pappus totally lacking.

  • Provided by: [B].Flora de Panama
    • Source: [
    • 1
    • ]. 

    Habit

    herbs or subshrubs

  • Provided by: [B].Flora de Panama
    • Source: [
    • 1
    • ]. 

    Distribution

    native in Central America from Honduras southward and in parts of northern South America.

  • Provided by: [B].Flora de Panama
    • Source: [
    • 1
    • ]. 

     Information From

    Compositae
    CC0 1.0 Universal (CC0 1.0). https://creativecommons.org/publicdomain/zero/1.0
    • A CC0 1.0 Universal (CC0 1.0).
    Flora de Panama
    http://www.tropicos.org/Project/PAC
    Robert E. Woodson, Jr. and Robert W. Schery Annals of the Missouri Botanical Garden Vol. 67, No. 4 (1980), pp. ii-xxxiii
    • B Missouri Botanical Garden