Ageratum microcarpum (benth. ex Benth.) Hemsl.

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.