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Abstract Detail



Systematics

Pyne, Milo [1], Poindexter, Derick [2], Bridges, Edwin [3], Orzell, Steve [4], Witsell, Theo [5].

A new species of Physalis from deep sands of Arkansas, Louisiana, and Texas.

Physalis L. (Solanaceae) is a primarily western hemisphere genus, which includes the edible P. peruviana Linnaeus (cape-gooseberry) and P. philadelphica Lamarck (tomatillo), as well as many weedy and ruderal species. We describe here a new species, found in the extensive deep sand soils of the Carrizo and related formations of Texas as well as on other deep sands of younger Coastal Plain formations in Arkansas, Louisiana, and Texas. The proposed new species is most easily recognized by its large obpyramidal fruiting calyx and its large and distinctly pitted seeds, which are 3-4 mm in diameter, this being twice as large as those found in other Physalis species. Flowering material is more difficult to separate from some specimens of Physalis heterophylla Nees, with which it may be sympatric. This new plant has been misidentified or confounded with large-calyced forms of other Physalis species, as well as with the more western P. hederifolia A. Gray, but it is distinct from these and all other taxa. Some earlier collections of this material had been previously identified as Physalis macrophysa Rydberg, a taxon that is best treated as a form of P. longifolia Nutt. var. subglabrata (Mackenzie and Bush) Cronquist. Other than large calyces, this taxon has little in common morphologically with the new species under consideration. In Texas, it is most common north and west of the Sabine Uplift. Its known range extends from south-central Texas (Bexar and Wilson counties) east and north to southwestern Arkansas (Miller County) and western Louisiana (Beauregard, Caddo, Cameron, Sabine, Union, Vernon, and Winn parishes). Louisiana material of the new species has commonly been determined as eastern outliers of P. hederifolia. This proposal for a new species of Physalis is supported by a morphometric analysis of specimens representing all of these possibly confounded taxa, including type material of P. macrophysa. Non-fruiting material of the new species may be difficult to distinguish from Physalis heterophylla; hair length and its density towards the base of stems will be useful in making this distinction. Specimens of P. heterophylla will have progressively densely hairy with elongate trichomes towards the base of the plant, and those of P. macrosperma will have shorter hairs which are not as densely aggregated at stem bases.


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1 - NatureServe, Ecology, 601a Foster St. , Durham, NC, 27701-1208, USA
2 - University of North Carolina, Biology, Herbarium, Coker Hall, 120 South Road, Chapel Hill, NC, 27514, USA
3 - Botanical and Ecological Consultant, 5904 72nd Ave, NW, Gig Harbor, WA, 98335, USA
4 - U. S. Air Force, 29 South Blvd., Avon Park AFR, FL, 33825, USA
5 - Arkansas Natural Heritage Commission, 1100 North Street, Little Rock, AR, 72201, USA

Keywords:
Physalis
groundcherry
Carizzo
macrosperma
morphometric
Sabine
tomatillo.

Presentation Type: Oral Paper
Session: 41, Systematics III: Euasterids
Location: Sundance 4/Omni Hotel
Date: Wednesday, June 28th, 2017
Time: 2:30 PM
Number: 41005
Abstract ID:403
Candidate for Awards:None


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