Tumamoca macdougalii

Rose

Contr. U.S. Natl. Herb. 16: 21, plate 17 [as macdouglai]. 1912.

Common names: Tumamoc globeberry
Illustrated
Treatment appears in FNA Volume 6. Treatment on page 30.

Stems: persistent woody portion 10–15 cm. Leaf blades 3–4.5 cm, ultimate segments linear to linear-lanceolate or narrowly ovate, 2–4 cm × 2–10 mm, surfaces hispidulous to pustulate-scabrous abaxially, glabrous adaxially. Inflorescences: staminate 2–19-flowered, 3.5–10 cm. Flowers: staminate: hypanthium 5–9 mm, petals 4–4.5 mm; pistillate: petals 5–6 mm. Fruits 0.8–1 cm diam. Seeds 7–8 mm.


Phenology: Flowering Jun–Oct.
Habitat: Semidesert grasslands, sandy washes and gullies, Atriplex flats, Sonoran desert scrub with Agave, Atriplex, Cercidium, Fouquieria, Jatropha, Lycium, Maytenus, Opuntia, Prosopis, and Stenocereus
Elevation: 700–1000 m

Discussion

In Tumamoca macdougalii, some plants produce all pistillate flowers, some all staminate flowers (dioecy), and some produce both pistillate and staminate (monoecy). Most plants apparently start the early summer as all staminate but only buds are produced, thus the staminate flowers quickly respond if rains come early. Pistillate flowers are not produced until the rains come in season, and then plants may be bisexual. The size of the tuber and the age of the plant may modify this schedule. Smaller plants may not produce pistillate flowers; larger plants may produce all pistillate flowers. (Biological information from Frank Reichenbacher, pers. comm.).

Selected References

None.

Lower Taxa

None.
... more about "Tumamoca macdougalii"
Guy L. Nesom +
Tumamoc globeberry +
Ariz. +  and Mexico (Sonora). +
700–1000 m +
Semidesert grasslands, sandy washes and gullies, Atriplex flats, Sonoran desert scrub with Agave, Atriplex, Cercidium, Fouquieria, Jatropha, Lycium, Maytenus, Opuntia, Prosopis, and Stenocereus +
Flowering Jun–Oct. +
Contr. U.S. Natl. Herb. +
Illustrated +
Tumamoca macdougalii +
Tumamoca +
species +