Lamourouxia colimae 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

4. Lamourouxia colimae Ernst & Baad. Madroño 20: 342. 1970[1971]. Type:— MEXICO. Colima: mountain summits near pass. ca. 11 miles south-southwest of Colima on Manzanillo Road , 500 m, 21 September 1958, R. McVaugh, H.F. Loveland & R.W. Pippen 18077 (Holotype: MICH1108003!)

Figure 5 D–F .

Shrubs or sub-shrubs up to 170 cm tall, stems branched along the plant, erect, woody, glabrescent, non-glandular. Leaves sessile, elliptic to lanceolate or ovate, 9–26 × 3–10 mm, margin dentate generally in the upper half, 3–6 teeth per side, teeth ca. 2 mm; apex acute or obtuse, base attenuate; membranous, glabrous to glabrescent, non-glandular. Inflorescence a raceme, erect, pedicels thin, 3–4 mm long. Bracts equal along inflorescence, sessile, oblong to lanceolate, 2.5–9.6 × 2.3–3.4 mm, margin entire, apex obtuse to truncate, base attenuate. Calyx campanulate without dots on the surface, 6–8.1 × 4–5.6 mm, lobes lanceolate to broadly triangular, 4–6 × 1.5–2.3 mm, margin entire, apex acute, glabrous or microscopically papillate. Corolla tubular, 26–35 × 5.7–8.4 mm, upper lip 12–16.5 mm, lower lip 13–15 mm long, lobes 1–1.2 × 1 mm; red scarlet, pubescent, non-glandular. Stamens exserted 2, filaments of lower pair ca. 32 mm long, anthers ca. 3 mm long, filaments of upper pair not seen. Style ca. 30 mm long. Stigma apparently bilobed, ca. 1 mm long. Capsule ovoid, 7–11 mm long, glabrous. Seeds not seen.

Etymology: —The name colimae refers to the city of Colima, located in the homonym state, where the holotype of the species was collected.

Distribution and Ecology: —This species is distributed in tropical deciduous forests, a rare type of vegetation for the genus, and at lower elevations than the typically known for Lamourouxia species, ranging from 450 to 500 m. Lamourouxia colimae is only known from two close localities, which are located at the summit of calcareous mountains near the city of Colima, Mexico ( Fig. 5F ), where the vegetation is dominated by diverse legumes ( Bursera and Cnidoscolus Pohl (1827: 56–63) spp. The species is very rare and only two specimens are known, one of them is in Mexico (IBUG).

Phenology: —The holotype collected in September 1958 possesses mature flowers and floral buds with absence of fruits. The second known specimen, collected in October 1984, shows mature infructescences with few deciduous corollas.

Notes: — The species has not been collected in the last three decades, and two specimens were stored in herbaria from the United States during this taxonomic revision. The species was looked for at the type locality in 2019, but it was not found .

Examined specimens:— MEXICO. Colima: 18 km al SE de Colima, carr. Colima a Manzanillo , 450 m, 31 October 1984, Santana & Cervantes 900 ( IBUG!, MEXU!) . [Coquimatlán] mountain summits near pass. ca. 11 miles south-southwest of Colima on Manzanillo Road , 500 m, 21 September 1958, McVaugh et al. 18077 ( MICH!) .

Figures

FIGURE 5. Lamourouxia brachyantha. A) Flowers. B) Inflorescence in the field. C) Distribution map. Lamourouxia colimae (Holotype, McVaugh et al. 18077). D) Dry inflorescence. E) Dry leaves. F) Distribution map. Credits in Appendix I.