Lamourouxia jaliscana Ernst & Baad. Madroño, 1971

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

9. Lamourouxia jaliscana Ernst & Baad. Madroño 20: 344. 1970[1971].

Type:— MEXICO. Jalisco: Sierra de Caule [Cuale], Southwest of Talpa de Allende , Southwest of Piedra Rajada , 1800–2250 m, 19–21 November 1952, R. McVaugh & J. Sooby Jr. 14250 (Holotype: MICH1108006!)

Figure 8 A–C .

Sub-shrubs up to 1.5 m tall, stems branched along the plant, probably reclining, woody, glabrescent non-glandular. Leaves opposite, petiolate, petioles up to 1.5 mm, narrowly lanceolate to linear-lanceolate, 50–80 × 6–10 mm, margin serrate, 10–22 teeth each side, teeth 0.5–1.5 mm long, apex acute very attenuate, base attenuate; possibly membranous, pubescent, non-glandular. Inflorescence a raceme, erect, pedicels thin, 5–8 mm long, one bract per flower. Bracts equal along inflorescence, sessile, linear to linear-lanceolate, 13.4–26.6 × 1.5–2.6 mm, margin dentate, 4–11 teeth per side, apex acute, base attenuate. Calyx campanulate without dots on the surface, 14–16 × 5 mm, four-lobed, lobes narrowly subulate, 10–12 × 2–3.7 mm, margin entire, apex acute, glandular-pubescent. Corolla tubular, 56–63 × 9–10, bilabiate, upper lip 14–27 mm long, lower lip 19.6–27 × 3.2–3.4 mm, apex three-lobed, lobes 4.3–9 × 0.7–1.6 mm; red, pubescent, non-glandular. Stamens exserted 2, filaments not seen, anthers 4.3–4.9 mm long. Style 55–65 mm long. Fruit a capsule, ovoid, 12–13 × 7–8 mm, glabrous. Seeds not seen.

Etymology: —The name of this species is dedicated to the state of Jalisco, where the species was collected.

Distribution and Ecology: —This species is endemic from Mexico and is only known from the state of Jalisco ( Fig. 8C ). Lamourouxia jaliscana is exclusive from the northern portion of the Sierra Madre del Sur province. The holotype reports it was collected in a pine forest between 1700 and 2250 m. The second known specimen has the annotation of “headwaters of the branch of Rio de Talpa (Talpa River) ”.

Phenology: —Flowers of two known specimens were collected in November. Fruits are unknown.

Notes: —The species was searched in November 2019, but it was not found. The type locality is a remote site at the summit of one of the mountains surrounding the municipality of Talpa , Jalisco. The flowering season coincides with the hurricane season in the Pacific Ocean, where unpaved roads are considerably damaged by the rain making the access difficult. It is recommended the use of 4×4 vehicles or specialized equipment to carry out long botanical expeditions in quest of Lamourouxia jaliscana .

Representative specimens:— MEXICO. Jalisco: Talpa de Allende, Sierra de Caule [Cuale], southwest of Talpa de Allende , southwest of Piedra Rajada, 1800–2250 m, 19–21 November 1952, R. McVaugh & J. Sooby Jr. 14250 (MICH!); 11–12 miles south of Talpa de Allende , headwaters of west branch of Rio de Talpa, 1200 –1700 m, 23–25 November 1960, McVaugh et al. 21325 (MICH!).

Figures

FIGURE 8. Lamourouxia jaliscana (Holotype, McVaugh & Sooby Jr. 14250). A) Inflorescence. B) Leaves. C) Distribution map. Lamourouxia longiflora. D) Inflorescence in the field. E) Dry leaves. F) Distribution map. Credits in Appendix I.