Lamourouxia paneroi Turner. Phytologia, 1993

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

17. Lamourouxia paneroi Turner. Phytologia 74(6): 465. 1993. Type:— MEXICO. Oaxaca: 7 km E of the turnoff to Santo Domingo Ozolotepec on road to San Juan Ozolotepec. 3700 m, 11 December 1992, J.L. Panero, Y. Kim & E. Manrique 3078 (Holotype: MEXU00638200 !; isotypes: CTES0014346 !, MSC0092237!, NY00008257!, TEX00372940!)

Figure 12 A–D .

Shrubs or sub-shrubs up to 150 cm tall, stems branched along the plant, erect, woody, shortly pilose, non-glandular. Leaves opposite, petiolate, petioles 0.5–1 mm, narrowly elliptic to elliptic-oblanceolate, 7–10 × 2–3 mm, margin crenulate, sometimes entire, lobes up to 1 mm long; apex rounded to obtuse, base attenuate to rounded; membranous, shortly hispid, non-glandular. Inflorescence a raceme, erect, pedicels thin, 1–3 mm long. Bracts equal along inflorescence, sessile, linear to narrowly subulate, 3–4 × 1–1.5 mm, margin entire, apex acute to obtuse, base attenuate. Calyx campanulate without dots on the surface, 9–10 × 4–5 mm, lobes triangular to narrowly ovate, 2–4 mm long, margin entire, apex aciculate to dentate, when dentate 1–4 teeth, shortly pilose, non-glandular. Corolla funnelform, 40–50 × 10–12 mm, upper lip 12–15 mm long, lower lip 9–12 mm long, lobes 2–3 mm long; bright red, hispidulous, non-glandular. Stamens exserted 4, filaments 43–53 mm long, anthers ca. 3 mm long. Style 45–55 cm, stigma not seen. Capsule ovoid, ca. 8 mm long, shortly hispidous, non-glandular. Seeds not seen.

Etymology: —The name of this species honors J.L. Panero, who collected the type specimen.

Distribution and Ecology: — Lamourouxia paneroi is endemic from the states of Oaxaca and Puebla ( Fig. 12D ). The species is reported from oak forests (with Juniperus flaccida Schlechtendal (1838: 495) , and xerophytic scrubs ( Agave marmorata Roezl (1883: 238) , Arctostaphylos Adanson (1763: 165) , Rhus sp. ) at elevations from 2100 to 3700 m. Previously, the species was only known from the type collection.

Phenology: —The species has a short season of flowering and fruiting from September to December.

Discussion: — Turner (1993) established Lamourouxia paneroi based on the difference on the vestiture in the calyx and the stem with respect to L. pringlei . Lamourouxia pringlei presents vestiture glandular-puberulous, and L. paneroi possesses indument short pilosulous. The taxonomic determination of the taxa is difficult work if a microscope or magnifying glasses are not available. For this treatment, all the specimens determined as L. pringlei were studied with stereoscopic microscopes due their similitude on leaves, bracts, and flowers. One additional character detected during the revision of the specimens was the presence of short and non-glandular black trichomes in the fruits of L. paneroi , especially on the base of the fruit, in contrast with L. pringlei , whose fruits are entirely glabrous. Both species are distributed in the same areas in southern states of Mexico.

Examined specimens: — MEXICO. Oaxaca: San Bartolomé Quialana, Cerro Yuubidan ( Picacho ), parte media del cerro, 3.5 km en línea recta al S de San Bartolomé Quialana, 2510 m, 25 January 2014, Carrillo-Reyes et al. 7216 ( IBUG!) . San Juan Bautista Coixtlahuaca, Cerro Verde al NE de Marcos Pérez, 2700 m, 05 November 1986, Tenorio & Frame 12309 ( MEXU!) . Santa Catarina Zapoquila, cañada al W de Membrillos, camino al Arco , 2100 m, 14 September 1991, Tenorio 17478 ( MEXU!) . Villa Tejúpam de la Unión , 6.2 km del entronque para la carretera para Santiago Tejúpan-Coixtlahuaca , 2220 m, 27 September 2002, Calzada 23305 ( MEXU!) ; 6 km al E de Tejúpan por la carretera a Suchixtlahuaca , 2300 m, 08 September 1990, Salinas et al. 5618 ( MEXU!) . Puebla: Asunción Nochixtlán, Cuesta Colorada, sobre la carretera Puebla-Oaxaca km 20, 2350 m, 19 December 1995, Flores 183 ( MEXU!) . Caltepec, Cerro Chicamole , al E de Membrillos, 2400 m, 08 November 1986, Tenorio & Frame 12345 ( MEXU!) . Chapulco, 4 km al E del entronque Tehuacán-Esperanza por la carretera a Orizaba , 2180–2250 m, 19 September 1990, Salinas et al. 5743 ( MEXU!) . Palmar de Bravo, Cuacnopalan, Cerro Filo Blanco , al S de Cuacnopalan, 2592 m, 29 September 2001, Tenorio & Kelly 21074 ( MEXU!) .

Figures

FIGURE 12. Lamourouxia paneroi. A) Inflorescence. B) Dry inflorescence. C) Dry leaves. D) Distribution map. Lamourouxia parayana. E) Inflorescence. F) Detail of leaves. G) Distribution map. Credits in Appendix I.