Mortonia
Smithsonian Contr. Knowl. 3(5): 34, plate 4. 1852.
Taxon | Illustrator ⠉ | |
---|---|---|
Maytenus phyllanthoides var. phyllanthoides Gyminda latifolia Mortonia scabrella |
Shrubs. Branchlets terete, scabrous. Leaves persistent, alternate, crowded; stipules present; petiole essentially absent; blade margins entire; 1-veined. Inflorescences terminal, cymose-panicles or racemes. Flowers bisexual, radially symmetric; perianth and androecium perigynous; hypanthium free from ovary; sepals 5, distinct; petals 5, white; nectary intrastaminal, usually lining hypanthium, fleshy; stamens 5, adnate to nectary margin; staminodes 0; pistil 5-carpellate; ovary superior, 5-locular, placentation axile; style 1; stigmas 5; ovules 2 per locule. Fruits nutlike (small, hard-walled, indehiscent), 1-locular, oblong to cylindric, apex beaked. Seeds 1 per fruit, oblong, not winged; aril absent.
Distribution
sw United States, Mexico, Central America
Discussion
Species 8–10 (4 in the flora).
Mortonia is poorly understood taxonomically.
Selected References
None.
Keys
2 | Leaf blades ovate or broadly elliptic to suborbiculate, 5–16 × 4–12 mm, length 1.2–1.4 times width. | > 3 |
3 | Leaves 5–6 × 4–5 mm; fruits 3.5–4.5 mm. | Mortonia scabrella |
3 | Leaves 7–16 × 5–12 mm; fruits 5–7 mm. | Mortonia utahensis |
1 | Leaf blades linear-oblanceolate or oblanceolate, 15–25 mm, length 5 times width, glabrous, pliable, margins often thickened, not revolute. | Mortonia greggii |
1 | Leaf blades ovate, elliptic, oblong-elliptic, suborbiculate, or obovate, 3–16 mm, length 1.2–2.5 times length, usually scabridulous, rarely glabrous, rigid, margins not thickened, revolute. | > 2 |
2 | Leaf blades oblong-elliptic to narrowly obovate, 3–5 × 1.5–2 mm, length 2–2.5 times width. | Mortonia sempervirens |
2 | Leaf blades ovate or broadly elliptic to suborbiculate, 5–16 × 4–12 mm, length 1.2–1.4 times width. | > 3 |
3 | Leaves 5–6 × 4–5 mm; fruits 3.5–4.5 mm. | Mortonia scabrella |
3 | Leaves 7–16 × 5–12 mm; fruits 5–7 mm. | Mortonia utahensis |