Lamourouxia microphylla 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

12. Lamourouxia microphylla Martens & Galeotti. Bull. Acad. Roy. Sci. Bruxelles 12(2): 31. 1845. Lectotype designated here:— MEXICO. Oaxaca, bois de l’O d’Oaxaca, 1840, H. Galeotti 1005 (Lectotype: K000533709!; isolectotypes: BR0000005423378!, BR0000005423705!, G00356756!, K000533710!, P02976340!, P02976341!)

= Lamourouxia parvifolia Bentham. Prodr. 10: 542. 1846. Lectotype designated here:— MEXICO. Oaxaca, bois de l’O d’Oaxaca, 1840, H. Galeotti 1005 (Lectotype: K000533709!; isolectotypes: BR0000005423378!, BR0000005423705!, G00356756!, K000533710!, P02976340!, P02976341!).

Figure 9 F–H .

Herbs up to 100 cm tall, stems branched along the plant, erect, woody, glabrescent non-glandular. Leaves opposite, petiolate, petioles up to 1 mm long, linear to oblanceolate, 6–10 × 2–3 mm, minutely crenate, 1–6 teeth each side, teeth up to 1 mm long; apex obtuse to rounded, base attenuate; apparently membranous, glabrous. Inflorescence a raceme, erect, pedicels thin, 2–5.7 mm long. Bracts equal along inflorescence, sessile, linear to narrowly lanceolate, 2.1–5.8 × 0.6–1 mm, sometimes with one lobe per side, up to 1 mm long, margin entire, apex acute to obtuse, base attenuate. Calyx campanulate without dots on the surface, 5–7 × 3–4 mm, four-lobed, lobes very reduced, triangular, 1–3 × 1 mm, margin entire, apex obtuse, glabrous. Corolla tubular, 35–41 × 5–6 mm, bilabiate, upper lip 15–18 × 4–5 mm, lower lip 10–16.1 × 2.3–7 mm, apex three-lobed, lobes 1.6–2.4 × 0.9 mm; red, pubescent, non-glandular. Stamens exserted 2, filaments not seen, anthers 3 mm long. Style 29.3–29.7 mm long, stigma 1 mm long. Fruit a capsule, spheric, 5–6 mm diameter, glabrous. Seeds not seen.

Etymology: —The name of the species refers to its small leaves.

Distribution and habitat: —This is an endemic species from Mexico. It is distributed in the states of Guerrero and Oaxaca ( Fig. 9H ). The species is present in pine forests and pine and oaks forests. The elevation recorded for this species is 1830–2290 m.

Nomenclatural notes: —The original description of Lamourouxia microphylla ( Martens & Galeotti 1845) cited the collections Galeotti 1005 with no herbarium location. Ernst (1972) cited five specimens, one in G, two in BR and K. Here, the specimen K000533709 with a branched stem, numerous small leaves, and open flowers has the best representation of the diagnostic features of the species. Other specimens have a few flowers and leaves.

Phenology: —The flowering and fruiting season of Lamourouxia microphylla is from August to November. The flowers were mainly collected in October.

Examined specimens: — MEXICO. Guerrero: Chilapa , 24 km al E de Chilapa, 06 November 1983, Tenorio & Ramamoorthy 4868 (MEXU!). Leonardo Bravo, Carrizal de Bravo, 6 km después, camino a Chichihualco , 2200 m, 24 August 1997, Cruz-Durán 1484 (MEXU!). Oaxaca: San Jerónimo Coatlán, Campamento San Mateo, 14 km al oeste de san Jerónimo , Hernández-Magaña et al. 5146 (MEXU!, MO). San Pablo Cuatro Venados , 15 km northwest of Zaachila on road to San Miguel Peras , 11 November 1983, Breedlove & Almeda 60114 (ENCB!, IBUG!). Zimatlán, Paraje Tierra Blanca, 8 km al SE de La Cofradía, comunidad de San Pedro El Alto , 2360 m, 27 October 1998, Miranda & Hernández 522 (MEXU!); base of Sierra de Clavellinas , 19 October 1894, Pringle 6000 (ENCB!, MEXU!, MO, P!, US!).

Figures

FIGURE 9. Lamourouxia macrantha. A) Habit. B) Lateral view of a flower. C) Detail of fruits. D) Leaves. E) Distribution map. Lamourouxia microphylla. F) Dry Inflorescence. G) Dry leaves. H) Distribution map. Credits in Appendix I.