hirsutism

Frutex 1-2 m altus, caulibus alatis, alis 1-2 mm latis, interruptis ad petiolorum bases, folia opposita, elliptica vel oblongi-elliptica, 6-9(11) cm longa, marginibus denticulatis, dentibus (18)25-30(34); capitula (3)6-10(12) in cymis, pedunculis 17-23 cm longis, phyllaria 22-24, 6.5-7.5 mm longa, obovata vel oblonga, pilosa, receptaculum conicum; flores radii 16-19, neutri, lamina oblongi-elliptica, 1.6-2.2 cm longa, lutea; flores disci 150-200, corollis 4-5.5 mm longis, luteis, lobis pilosis, antheris nigricantibus; achenia applanata, oblanceolata, 4.2-4.5 mm longa, nigra, ad apicem pilos sejunctos ferentia, alis stramineis, ca.

Inflorescentiae in paniculis brevibus, laxis, pedunculatis, ad 6 floribus, aut monocasiis aut dichasiis vel floribus solitariis pedicellatis, pubescentibus; bracteolis filiformibus, pilosis. Flores masculi 4-meri; calyx lobulis lanceolatis, supra subtusque dense pilosis; petalis incurvatis; stamina 8.

2.7 mm longa, filamentis pilosis, stylus 2.5 mm longus pilosus; flos microstylus: stamina brevia ca.

Planta annua aquatica vel subaquatica erecta vel ascendens ad 80 cm alta; caules fistulosi saepe proximaliter radicantes, dense hirsuto-pilosi pilis pluricellulosis ad 2 mm longis et breviter glanduloso-puberuli; folia supera sessilia, cetera bases petiolares ad 1.5 cm longas et 4 mm latas ferentia, laminis plerumque ovalis (2)3-5(6) cm longis, (0.8)1.5-3.5 cm latis, apice acutis vel acuminatis triplinervatis utrinque pilosis; capitula aggregata in catervis paniculiformibus dichotomis foliosis, juventute subglomerata; involucri bracteae externae 3(4) patentes vel reflexae plerumque lineares 2-3 mm longae, internae (4)5(6) plerumque ellipticae ca.