Malaxis corymbosa

(S. Watson) Kuntze

Revis. Gen. Pl. 2: 673. 1891.

Basionym: Microstylis corymbosa S. Watson Proc. Amer. Acad. Arts 18: 195. 1883
Synonyms: Achroanthes corymbosa (S. Watson) Greene
Treatment appears in FNA Volume 26. Treatment on page 630. Mentioned on page 627, 631.

Plants 6–40 cm. Pseudobulbs 5–15 mm diam. Leaves 1(–2, rarely), near middle of stem; blade green, glossy, oval or broadly elliptic, cordate, 3–9 × (1.2–)3–6.4 cm, apex acute. Inflorescences corymbose racemes, 1.5–3 cm; floral bracts triangular, 0.8–1.2(–2.5) mm, apex acute; pedicels crowded. Flowers 10–33, resupinate, green; sepals recurved at apex, ovate-elliptic or lanceolate, (2.8–)3.6–4.2 × 1.4–1(–2) mm, apex subobtuse to acute; petals strongly reflexed, crossing behind flower, linear to filiform, (2–)3.5–4 × 0.2–0.6 mm, apex obtuse; lip triangular, 3–4 × 1.5–2.3 mm, base upcurved, cordate or hastate-auriculate, apex entire, narrowly obtuse to somewhat abruptly acuminate; column 0.4–0.6(–1) × 0.4–0.6(–1) mm; pollinia yellow. Capsules horizontal to erect, ellipsoid, 12 × 4 mm.

Phenology: Flowering summer.
Habitat: Shaded mountain canyons
Elevation: 2000 m


V26 1291-distribution-map.jpg

Ariz., Mexico, n Central America.


Malaxis corymbosa grows in the Santa Rita, Huachuca, and Chiricahua mountains in Arizona. It differs from some of its close relatives in Mexico by having a more flattened and less fleshy lip that is less deeply concave proximal to anthers. Plants have 10–33 flowers open at one time and may produce a much larger number.

The hemipollinaria are apically widely divergent.

Selected References


Lower Taxa