Lamourouxia tenuifolia Martens & Galeotti. Bull.Acad. Roy. Sci. Bruxelles, 1845

Francisco-Gutiérrez, Antonio, Ruiz-Sanchez, Eduardo, González, Dolores & Lira-Noriega, Andrés, 2023, Lamourouxia (Orobanchaceae) of Mexico, Phytotaxa 582 (1), pp. 1921-1935 : 1921-1935

23. Lamourouxia tenuifolia Martens & Galeotti. Bull.Acad. Roy. Sci. Bruxelles 12(2): 32. 1845. Lectotype designated here:— MEXICO, dans les bois de regions tempérees froides de la cordillère orientale d’Oaxaca (San Andreas, Roayaga, etc.), 6000 pieds, 1840, H. Galeotti 992 (Lectotype: BR0000005423712 !; isolectotypes: F [IRN:219879 photo!], G00356750!)

= Lamourouxia conzatti Greenman. Proc. Amer. Acad. Arts 35(16): 312. 1900. Lectotype designated here:— MEXICO. Oaxaca: Cerro de Pápalo, camino de Cheve, Cuicatlan , 2500 m, 16–22 June 1898, V. González & C. Conzatti 760 (Lectotype: GH00022184 !; isolectotypes: GH00022183!, US362792!, VT UVMVT026734!).

Figure 14 F–H .

Herbs up to ca. 100 cm tall, stems branched along the plant, erect, woody, glabrous or glabrescent, non-glandular. Leaves opposite, sessile, linear to narrowly lanceolate or subulate, 10–32 × 1–1.3 mm, margin minutely serrate, 6–10 teeth per side, teeth up to 1 mm long: apex acute, base truncate; apparently membranous, glabrous to glabrescent, nonglandular. Inflorescence a raceme, erect, pedicels thin, 3.8–7.3 mm long. Bracts equal along inflorescence, sessile, linear, 5–22 × 1.5 mm, margin generally entire, rarely serrate with three small teeth, apex acute, base attenuate. Calyx campanulate without dots on the surface, 5.8–12.2 × 4–6 mm, lobes triangular, 3–7.2 × 0.6–2.6 mm, margin entire, apex acute, glabrescent, non-glandular. Corolla tubular, 45–55 × 9–13 mm, upper lip 11–19 × 9–13 mm, lower lip 5–12 × 5–10 mm, lobes 2–3 mm long; red, pubescent, non-glandular. Stamens exserted 2, filaments not seen. Style 40–45 mm long, stigma bilobed, 1.6 × 0.7 mm long. Capsule ovoid, 8.4–12 × 5–8 mm. Seeds not seen.

Etymology: —The epithet of the species means thin leaves.

Distribution and Ecology: — Lamourouxia tenuifolia is endemic from the states of Guerrero and Oaxaca ( Fig. 14H ). The species inhabit oak forest and pine-oak forests at elevations from 1500 to 2931 m.

Phenology: —Flowering and fruiting seasons extend from January to October.

Nomenclatural notes: — Lamourouxia tenuifolia was described by Martens & Galeotti (1845) citing the specimen Galeotti 992 with no herbarium. Robinson & Greenman (1895) mentioned that the species was collected by Galeotti, but no collection number was given. Ernst (1972) cited duplicates in BR, G, and W as “type specimens” omitting the corresponding lectotypification. Specimen in W was not located in the online database of this herbarium. Here, the specimen in BR was designated as lectotype because it is the best conserved, having a larger amount of leaves and two mature flowers, against few leaves and one mature flower and two immature flowers and two floral buds.

Lamourouxia tenuifolia was described originally by Greenman (1900) citing two collections: V. González & C. Conzatti 760, and C. Conzatti 965. It was selected as lectotype the first collection due to it being the only with online access in GBIF for future consults. No data was found of the latter. Of the lectotype there are three specimens, having the GH00022184! specimen the largest flowers and largest amount of leaves.

Examined specimens: — MEXICO. Guerrero: Acatepec, along the Milpillas-Atoyac road via Puerto del Gallo about 56.5 miles southwest of Mexico Highway 95, about 19.5 miles southwest of Carrazal del Bravo and 3 miles north of Yerba Santa , 17 October 1975, Reveal et al. 4275 (MEXU!, US!). Chilpancingo de los Bravo, on road to San Vicente S of Omiltemi, 18 October 1984, Breedlove 61868 (MEXU!). Oaxaca: Comaltepec, S. de Comaltepec, 11 September 1988, López & Martin 272 (MEXU!, MO). Ixtlán de Juárez , June 1906, Conzatti s.n. (ENCB!). San Ildefonso Villa Alta, Cerro de Yalina , June 1899, Conzatti s.n. (GH!); Villa Alta , April 1949, Paray 122 (MEXU!). San Juan Quiotepec, Santa María Totomoxtla , a 1 km del crucero o a 5 km del pueblo, 2931 m, 19 June 2002, Torres-Colín 16459 (MEXU!). Santiago Laxopa , June 1842, Liebmann 9393 (L!, US!). Santiago Xiacuí, 9 east of Calpulalpam, 12 September 1980, Martin 161 (ENCB!, MEXU!, MO). Along trail from San Pedro Nolasco to Llano Verde , 2000–2200 m, 22 July 1973, McPherson 812 (ENCB!); on mountains ridges between Teotitlán del Camino & Huautla de Jiménez , 08 July 1972, Webster et al. 17278 (MEXU!).

Figures

FIGURE 14. Lamourouxia smithii (Smith 155). A) Detail of inflorescence. B) Leaves. C) Distribution map. Lamourouxia stenoglossa (isotype, Ghiesbreght 706). D) Inflorescence. E) Leaves. F) Distribution map. Lamourouxia tenuifolia (Conzatti 965). G) Inflorescence. H) Distribution map. Credits in Appendix I.