Lindernia adami-hefiedi (Linderniaceae) - a new species from Madagascar Author Fischer, Eberhard text Phytotaxa 2023 2023-05-12 597 2 111 127 http://dx.doi.org/10.11646/phytotaxa.597.2.2 journal article 10.11646/phytotaxa.597.2.2 1179-3163 Key to Lindernia s.str. in Madagascar (partly after Fischer 1995 ) 1. Corolla very small ( 2–3 mm long), flowers cleistogamic, stamens 2, staminodes minute, present or absent ...................................2 - Corolla much larger ( 5–14 mm long), cleistogamic flowers absent, stamens 2, staminodes distinct, filiform, always present...... 3 2. Plants prostrate, chasmogamic flowers present, corolla with two filiform staminodes, stigma bilobed ............................................. ................................................................................................................... L. benthami Fischer, Schäferhoff & Müller (2013: 225) - Plants erect, all flowers cleistogamic, corolla without staminodes, stigma spathulate ....................................................................... ..................................................................... L. madagascariensis (Bonati 1924: 103) Fischer, Schäferhoff & Müller (2013: 226) 3. Plants aquatic, leaves spathulate, obtuse, widest in upper third, on water surface, well developed only in apical part of stem ......... ............................................................................................................................................................. L. natans Fischer (1995: 250) - Plants terrestrial in humid places, leaves ovate-rounded to lanceolate, acuminate to obtuse, widest at middle, base of stem with well developed leaves ............................................................................................................................................................................... 4 4. Staminodes incurved, falcate, plants minute, resembling a moss, tufted, leaves not exceeding 3 mm of length ................................ .......................................................................................................................................................... L. bryoides Fischer (1995: 248) - Staminodes straight or only slightly curved, never falcate, leaves generally longer than 3 mm ........ L. rotundifolia - group ..........5 5. Leaves rounded-orbicular to rounded-ovate, leaf length-width ratio 0.8–1.6 ...................................................................................6 - Leaves ovate to lanceolate-ovate, leaf length-width ratio 1.75–3.5 ..................................................................................................8 6. Dense long-stalked glandular hairs on stems, leaves, pedicels and calyx, leaves matt, pedicels 12–20 mm long, corolla 10.5–13 mm long, white with blue spots, free part of staminode 3–3.5 mm , without filiform appendage................................... L. adami-hefiedi - Short-stalked glandular hairs on pedicel and calyx or only on calyx,, leaves shining, pedicels not exceeding 7 mm of length, corolla not exceeding 10 mm of length, white with blue spots or entirely white, free part of staminode not exceeding 2 mm of length, with or without filiform appendage........................................................................................................................................7 7. Leaves rounded-orbicular, shining, 7–11 × 6–11 mm , pedicel 5–7 mm long, corolla white with blue spots, 8–10 mm long, free part of staminode 2 mm , without filiform appendage ........................................................................................................ L. rotundifolia - Leaves ovate-orbicular, 4–8 mm × 3–5 mm , pedicel 3–4 mm long, corolla white, sometimes tinged blue but without blue spots, 6 mm long, free part of staminode 1.3 mm long, with filiform appendage 0.1 mm long ...................................................... L. viguieri 8. Plants erect, short-stalked glandular hairs on upper leaves, pedicel and calyx, leaves shining, ovate, 5–7 nm × 2.5–4 mm , acuminate, pedicel 5 mm long, corolla white with blue spots, 5.8–6.2 mm long, free part of staminode 1.2–1.3 mm long, with filiform appendage 0.1 mm long.................................................................................................................................................. L. lemuriana - Plants prostrate to ascending, glandular hairs absent, leaves lanceolate-ovate, (7) 10–25 mm × (2) 4–8 mm , acuminate to obtuse, pedicel 20–30 mm long, corolla white tinged mauve, 10–12 mm long, free part of staminode 2.5 mm , with filiform appendage 0.3 mm long....................................................................................................................................................................... L. oblongifolia