|
|
|
1a. Pteridium aquilinum var. caudatum (Linnaeus) Sadebeck, Jahrb. Hamburg. Wiss. Anst. Beih. 3: 5. 1897.
Lacy bracken
Pteris caudata Linnaeus, Sp. Pl. 2: 1075. 1753; Pteridium caudatum (Linnaeus) Maxon
Petiole 20--75 cm. Blade broadly ovate to deltate, 2--3-pinnate-pinnatifid, 30--100 × 20--80 cm; blades, rachises, and costae usually densely covered abaxially with abundant, straight, stiff, subappressed to spreading hairs. Pinnae all narrowly to broadly triangular; terminal segment of each pinna ca. 10 times longer than wide, longer ultimate segments several times their width apart, ca. 1--2.5 mm wide. Pinnules at nearly 90° angle to costa; fertile ultimate segments only decurrent, or more decurrent than surcurrent. Outer indusia entire, glabrous.
In barrens, pine woodlands, and edges of deciduous woods in strongly acid to circumneutral soil, forming large colonies in exposed sites; 0 m; Fla.; Mexico; West Indies; Bermuda; Central America; South America from Colombia to Peru.
In Florida and West Indies material, the abaxial surfaces are quite hairy; in Central American material they are often much less hairy.
|
|
|
|
| 1 (1) |
Fertile ultimate segments only decurrent or more decurrent than surcurrent, mostly 1–2 mm wide; hairs on abaxial surface of blades abundant, straight, stiff, subappressed to spreading. 1a. Pteridium aquilinum var. caudatum |
|
(1) |
| + |
Fertile ultimate segments adnate or equally decurrent and surcurrent, mostly 3–6 mm wide; hairs on abaxial surface of blades abundant to sparse, twisted and flexible, if abundant then lax, spreading. |
|
(2) |
| |
|
|
|
| 2 (2) |
Pinnules at nearly 90° angle to costa; outer indusium pilose on margin and often on surface; hairs on abaxial surface of blades abundant, lax, and spreading. 1b. Pteridium aquilinum var. pubescens |
|
(2) |
| + |
Pinnules at 45°–60° angle to costa; outer indusium glabrous; hairs on abaxial surface of blades sparse or blades nearly glabrous. |
|
(3) |
| |
|
|
|
| 3 (3) |
Terminal segments of pinnules 2–4 times longer than wide; segment margins and abaxial surface of blade midrib and costae shaggy. 1c. Pteridium aquilinum var. latiusculum |
|
(3) |
| + |
Terminal segments of pinnules ca. 6–15 times longer than wide; segment margins and abaxial surface of blade midrib and costae sparsely pilose to glabrous. 1d. Pteridium aquilinum var. pseudocaudatum |
|
(1) |
|
|
|
| Related Links (opens in a new window) |
|
Other Databases
|
|
|
|
|
|
|
|
|
