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Published In: The Genera of North American Plants 2: 251. 1818. (Gen. N. Amer. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 7/9/2009)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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3. Asplenium pinnatifidum Nutt. (lobed spleenwort) Pl. 1i,j; Map 3

Leaves 3–22 cm long, monomorphic. Petioles brown at the base, green above, not shiny. Leaf blades simple, deeply lobed and sometimes nearly compound at the base, narrowly deltoid in outline, the tip long-attenuate, rarely rooting and forming plantlets vegetatively. Veins free, rarely anastomosing. Spores 64 per sporangium. 2n=144. May–October.

Uncommon in the eastern half of the Ozark Division (eastern U.S. west to Oklahoma). Ledges and crevices of shaded sandstone and granite bluffs and boulders.

The lobed spleenwort is a fertile, tetraploid derivative that resulted from hybridization between A. montanum and A. rhizophyllum. It occupies habitats similar to those of A. bradleyi, and the sterile, tetraploid hybrid between the two taxa is known as Asplenium ¥gravesii Maxon, or Graves's spleenwort (Pl. 1c,d). This rare hybrid is vouchered by a single, historical collection from Madison County.

Elsewhere, A. pinnatifidum has been documented to hybridize with A. montanum (A. ¥trudellii Wherry), A. platyneuron (A. ¥kentuckiense T.N. McCoy), and A. trichomanes (A. ¥herb-wagneri W.C. Taylor & Mohlenbr). The last two are likely to be found in Missouri eventually. For a discussion of the morphologically similar A. ¥ebenoides (A. platyneuron ¥ A. rhizophyllum), see the treatment of A. rhizophyllum.

 


 

 
 
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