Mortonia

A. Gray

Smithsonian Contr. Knowl. 3(5): 34, plate 4. 1852.

Etymology: For Samuel George Morton, 1799–1851, North American naturalist
Treatment appears in FNA Volume 12. Treatment on page 128. Mentioned on page 112.
 TaxonIllustrator 
FNA12 P16 Gyminda latifolia.jpegMaytenus 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
... more about "Mortonia"
Jinshuang Ma +  and Geoffrey A. Levin +
A. Gray +
sw United States +, Mexico +  and Central America +
For Samuel George Morton, 1799–1851, North American naturalist +
oblong;cylindric +
axillary +  and terminal +
bisexual +  and unisexual +
crowded +  and alternate +
persistent +
intrastaminal +
parietal +, axile +  and placentation +
distinct +
Smithsonian Contr. Knowl. +
distinct +
Mortonia +
Celastraceae +
evergreen +, deciduous +, perennial +  and annual +
polygamomonoecious +, dioecious +  and synoecious +