Menonvillea marticorenae (Al-Shehbaz) Salariato & Al-Shehbaz, 2014

Salariato, Diego L., Zuloaga, Fernando O. & Al-Shehbaz, Ihsan A., 2014, A revision of the genus Menonvillea (Cremolobeae, Brassicaceae), Phytotaxa 162 (5), pp. 241-298 : 279-281

17. Menonvillea marticorenae (Al-Shehbaz) Salariato & Al-Shehbaz , comb. et stat. nov. Menonvillea filifolia Fisch. & C.A. Mey. subsp. marticorenae Al-Shehbaz (2006: 360) . Type:— CHILE. [Región de Coquimbo]. Carretera Panamericana, 89 km al norte de los Vilos, [250 m, 31°11′S, 71°36′W], 13 October 1963, C. Marticorena & O. Matthei 122 (holotype CONC 70351!).

Annuals. Stems (8−)15−28(−30) cm, erect, simple or branched at base, glabrous throughout or rarely sparsely pubescent with simple, flat, slender trichomes to 0.5 mm long. Leaves sessile to subsessile; blade of basal and lowermost cauline leaves filiform, undivided or trifid into filiform segments, (2.2−)2.5−6(−10) cm × 0.4−1 mm, glabrous or sparsely pubescent, base attenuate, margin entire; upper cauline leaves smaller, filiform, undivided. Racemes terminal or axillary, ebracteate, corymbose, elongated considerably in fruit, (1.8−)3.5−7(−10) cm long; rachis glabrous or sparsely pubescent, straight in fruit; fruiting pedicels ascending, straight or slightly arcuate, (1.5−)2−7(−9) mm long, sparsely pubescent with simple, slender trichomes. Sepals oblong, 1.5−2.5(−3) × 1−1.2(− 1.4) mm, glabrous, erect, slightly saccate at base or not, caducous, margin membranous; petals yellow, narrowly spatulate, 2.5−4.5(−5) × 0.6−1.2(−1.5) mm, clawed, base obscurely papillate; stamens tetradynamous; filaments free, erect, minutely papillate and not dilated at base, 1.6−2.5(−3) mm long; anthers narrowly ovoid, (0.4−) 0.5−0.8 mm long, sagittate at base; nectar glands 4, confluent, flat, petaloid. Fruits broadly ovate to suborbicular; valves 2- winged, 2.5−4(−4.5) × (2.5−)3−3.5(−4) mm, deeply notched basally, slightly to deeply emarginate apically, with well-developed, somewhat tuberculate oblong callus at center of dorsal side, often with abundant clavate papillae between callus and wing, sparsely papillate ventrally; wings 0.5−0.8(−1.2) mm wide, crenate to entire, undulate; gynophore 0.5−1.4 mm long; style 1.2−1.5 mm long; stigma 2-lobed, slightly decurrent. Seeds ovate, 1.5−2 × 0.9− 1.1 mm, wingless, slightly compressed; cotyledons incumbent. Fig. 19 .

Distribution and habitat:— This endemic species of Chile grows from Región III (Atacama) to IV (Coquimbo) and V (Valparaiso) from sea level to 900 m ( Fig. 13G ).

Phenology:— Flowering between September and October.

Taxonomic notes:— Al-Shehbaz (2006) divided Menonvillea filifolia into subspecies filifolia and marticorenae based primarily on smaller flower size. However, they can be easily separated by other characters, including the presence in subsp. marticorenae of non-saccate or slightly saccate (vs. strongly saccate) sepal bases, obscurely papillate (vs. conspicuously papillate) petal bases, and ovoid (vs. narrowly oblong) anthers. For these reasons, subsp. marticorenae is elevated herein to the species rank.

Representative Specimens:— CHILE. III Atacama: Prov. Huasco, Com. Freirina, Tololopampa ( Pampa de Tololo ), 18 September 1957, Cabrera 12678 ( BAA) . IV Coquimbo: Prov. Choapa, Com. Los Vilos, Carretera Panamericana 8 km al N of Los Vilos , 12 October 1963, Marticorena & Matthei 93 ( CONC) ; Prov. Elqui, Com. La Higuera, Rte 5, N of La Serena, ca. 1 km N of the entrance to the El Tofo mine, at a bridge over a dry creek, 30 October 1991, Taylor et al. 10669 ( CONC) ; Prov. Limarí, Com. Ovalle, Quebrada Grande , entre Amolanas and Quebrada Teniente, 10 September 1942, Wagenknecht 46 ( CONC) . V Valparaíso: Prov. Petorca, Com. La Ligua, al Norte de Longotoma , 18 October 1963, Garaventa 8001 ( BAA, CONC, SI) ; Prov. Quillota, Com. Quillota, Cerro La Cruz , 1 October 1957, Garaventa 8000 ( CONC) ; Prov. Valparaíso, Com. Valparaíso, Laguna Verde , October 1960, Garaventa 7098 ( SI) .

Figures

FIGURE 13. Distribution of species of Menonvillea sect. Menonvillea. A, M. chilensis. B, M. constitutionis. C, M. filifolia. D, M. flexuosa. E, M. linearis. F. M. litoralis. G. M. marticorenae. H, M. minima. I, M. orbiculata. J, M. pinnatifida. K, M. purpurea.

FIGURE 19. Menonvillea marticorenae (Al-Shehbaz) Salariato & Al-Shehbaz. A, plant. B, leaf trichome. C, flower. D, sepal. E, petal. F, nectar glands, stamens and ovary. G, stamen. H, fruit mericarp, dorsal view. I, fruit mericarp, ventral view. J, seed. K, embryo. From Garaventa 8001 (CONC). Scale bars: A = 1 cm; B = 200 µm; C–K = 500 µm.