New names in Monotagma (Marantaceae) Author Hagberg, Mats Author Eriksson, Roger text Phytotaxa 2011 2011-03-01 20 1 1 25 http://biotaxa.org/Phytotaxa/article/view/phytotaxa.20.1.1 journal article 10.11646/phytotaxa.20.1.1 1179-3163 4776634 9. Monotagma papillosum Hagberg & R.Erikss. , sp. nov. ( Fig. 3A ) Bracteis roseis, synflorescentiae axe prinicipali nodis paucis, nodo inferiore folio frondoso instructo et laminae apice ± centrico Monotagmatis yapacanensi similis, sed ab eo differt lamina adaxiali pagina papillosa (vs. laevi), foliis caulinis pulvinis longioribus (2.4–4 vs. 1.1–2.1 cm ) et laminis majoribus (35–51 vs. 25–36 cm longis), pedunculis florescentiarum lateralium brevioribus (ca 1 vs. ca 10 cm ), et tubo corollae longiore (15–18 vs. 12–14 cm ). Type :— VENEZUELA . Amazonas : Tobogán de la Selva , 85 m , 19 April 1987 , Hagberg & Medin 378 ( holotype VEN , isotypes GB , INPA , MO , MYF , TFAV ) . Herb 1.5–2 m tall. Rhizomes subterraneous, branched to form clusters of up to ca 10 shoots, each shoot bearing 1–3 ± distichous basal leaves. Ultimate basal leaf with sheath 44–67 cm long, subcoriaceous to coriaceous, appressed-hirsute throughout, not auriculate; petiole 26–51 cm long, laterally ± flattened, without an adaxial groove, glabrous; pulvinus 3–4 cm long, laterally ± flattened, puberulent adaxially or ± glabrous, without annulus; blade ovate, ± chartaceous, base obtuse, apex acuminate, ± centric (apex displacement rarely up to 0.5 cm ), 38–58 × 9.8–12 cm , length from base to broadest part 8–22 cm , adaxial surface papillose, matt green, appressed-hirtellous at apex, abaxial surface not papillose, greyish green, ± hirtellous at apex. Synflorescence 5–8-nodate with 9–30 florescences, lowermost node with a well-developed leaf, sheath 6–11 cm long, petiole 0.7–4.8 cm long, pulvinus 2.4–4 cm long, blade 35–52 × 6.5–12 cm , each subsequent node with a bladeless sheath, first internode 1.7–3.5 cm long, peduncle 90–140 cm long, glabrous. Main florescence 7.5–17 cm long, with 10–18 ± distichous bracts, first internode 0.7–1.1 cm long, peduncle 0.9–1.2 cm long; lowermost bract 1.8–2.1 × 0.8–0.9 cm , scarlet red, chartaceous, glabrous except for a tuft of hairs at apex; first prophyll 11–12.5 mm long, glabrous or slightly hirtellous at apex. Flowers 3–4 per bract; pedicel 0.5–1 mm long; ovary 1–2.5 mm long, puberulent to hirtellous throughout or rarely apically; sepals 7–9.5 × 1.5–2 mm , white, apex obtuse; corolla tube 15–18 × ca 1.5 mm , orange red towards lobes, base white, outside glabrous, inside hirsute in mouth, or rarely hirsute throughout except for a glabrous basal portion, lobes 4.5–5 × 2.5–3.5 mm , only slightly open, leaving a small pore at apex, red, dark red adaxially towards apex; outer staminode absent; stamen and inner staminodes orange red, stamen 4–5 mm long, appendage tapering to base of theca, theca 1–2 mm long; callose staminode 3.5–4 × 2.5–3.5 mm , fleshy throughout, with a shelf-shaped callus at 1–1.5 mm from apex; cucullate staminode 3.5–4 mm long, appendage 1 mm long; style 3.5–4 mm long (tripped). Capsule 14–16 × ca 3.5 mm ; seed ca 14 × ca 3 mm ; aril ca 4 mm long, with two flattened unilateral lobes. Distribution and habitat :—Southern Venezuela ( Amazonas ), around Puerto Ayacucho. At the type locality it was found along streams in slightly disturbed primary forest with igneous outcrops, at 80–150 m elevation. Discussion :— Monotagma papillosum is most similar to M. yapacanensis , from which it differs by having a papillose epidermis on the adaxial surface of the leaf blades (vs. smooth), a synflorescence leaf with longer pulvinus (2.4–4 vs. 1.1–2.1 cm ) and usually longer blade (35–52 vs. 25–36 cm ), lateral florescences with shorter peduncles (up to ca 1 vs. to ca 10 cm ), longer bracts (1.8–2.1 vs. 1.5–1.7 cm ), and longer corolla tubes (15–18 vs. 12–14 mm ). Paratypes :— VENEZUELA . Amazonas : Hills and base of hills near Cachama , 23 km NE of Puerto Ayacucho , April 1978 , Davidse & Huber 15227 ( GB , MO ) ; 23 km NE of Puerto Ayacucho , April 1978 , Davidse & Huber 15400 ( MO ) ; Tobogán de la Selva, February 1979 , Plowman 7717 ( F , GB , K , NY ) ; May 1977 , Steyermark & Huber 113850 ( F , MO , VEN ) ; May 1980 , Steyermark et al. 122464 ( MO , VEN ) ; September 1985 , Steyermark et al. 131529 & 131564 ( GB , MO ) ; March 1979 , Trujillo & Pulido 15190 ( MY ) . CULT . Lyon Arboretum (orig. from El Tobogán , Venezuela ) , December 1985 , Nagata 3435 ( GB ) .