Perityle saxicola (Roosevelt Dam Rock Daisy)

Overview

Critically Endangered

Common Names

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Common Names in English:

Fish Creek Rock Daisy, Roosevelt Dam Rock Daisy, Roosevelt Dam Rockdaisy

Description

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Genus Perityle

Annuals , perennials , subshrubs , or shrubs , 2-45(-75) cm (glabrous or hairy , often gland-dotted). Stems erect to pendent. Leaves mostly cauline; often proximally opposite, distally alternate; petiolate or sessile; blades usually 3-lobed, ultimate margins entire, toothed , or lobed . Heads radiate or discoid , borne singly or in corymbiform arrays. Involucres campanulate , cylindric , funnelform , or hemispheric , 3-15 mm diam. Phyllaries persistent , 5-28 in (1-) 2(-3) series (distinct , linear to ovate , equal or subequal , flat or keeled , glabrous or hairy, apices obtuse , acute, or attenuate). Receptacles flat or convex , pitted , epaleate. Ray florets 0, or (1-) 3-18, pistillate , fertile ; corollas cream, yellow, or white (showy or rudimentary ). Disc florets 5-200, bisexual , fertile; corollas cream, yellow, or white, tubes shorter than or nearly equal to cylindric, funnelform, or campanulate throats, lobes 4, ± deltate (acute; stamens 4; style branches flattened, linear, usually tapering to fine, minutely hairy tips). Cypselae (black) flattened to subcylindric , linear to oblanceolate or obovate (margins ± calloused and glabrous, hairy, or ciliate , faces usually hairy, sometimes glabrous) ; pappi 0, or persistent or falling, of 1-35 bristles plus callous crowns or hyaline scales . x = 17, 19.

Species 66: United States, Mexico, South America.

Most species of Perityle are rock-dwelling subshrubs exhibiting geographic speciation ; most are found in the eroded mountain and basin region of the southwestern United States.[1]

Physical Description

Species Perityle saxicola

Perennials or subshrubs , 20-40 cm; glabrate or puberulent . Leaves: petioles 10-30 mm; blades (2-) 3-pinnate, 15-55 × 10-50 mm, lobes linear to flat-filiform, scarcely broadened distally. Heads borne singly or (2-4) in loose , corymbiform arrays, 7.5-10 × 10-14 mm. Peduncles 1-3 mm. Involucres broadly campanulate to hemispheric . Phyllaries 14-25, linear-lanceolate to lanceolate, 5-7 × 0.5-1 mm. Ray florets 10-17; corollas yellow, laminae oblong to oblong-ovate, 4-6 × 2-3.2 mm. Disc florets 75-200; corollas yellow, tubes 1-1.2 mm, throats narrowly tubular to narrowly funnelform , 2-2.5 mm, lobes ca. 0.7 mm. Cypselae narrowly oblanceolate to narrowly oblong-elliptic, 2.8-3.2 mm, margins notably calloused, sparsely short-hairy; pappi 0 or of 1(-2) bristles (2-) 4-5 mm. 2n = 34. [source]

The 2-3-pinnately dissected leaves with long-linear to flat-filiform lobes distinguish it from the similar P. gilensis with its broader leaf lobes. [source]

Flowers: Bloom Period: February, March, April, May, June, July, August, September, October.

Habitat

Crevices of igneous rocks; of conservation concern; 700-1100 m (Ref. 101627).

Taxonomy

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Kingdom: Plantae () - Plants
- Phylum: Tracheophyta () - Vascular Plants
  - Class: Magnoliopsida () - Dicotyledons
    - Order: Asterales ()
      - Family: Noctuoidea ()
        Genus: Perityle () - Bentham, Bot. Voy. Sulphur. 23, plate 15. 1844. - Rock daisy [Greek peri, around, and tyle, a callus, alluding to calloused cypselae margins]
        Specific epithet: saxicola - (Eastwood) Shinners, Southw. Naturalist. 4: 204. 1959.
        Botanical name: - Perityle saxicola (Eastw.) Shinners

Unambiguous Synonyms

Laphamia palmeri Gray
Laphamia palmeri var. tenella M. E. Jones
Laphamia saxicola Eastw.
Laphamia saxicola Eastwood, Proc. Calif. Acad. Sci. , Ser. 4, 20: 159. 1931

Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 15-Mar-2000

Similar Species

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Members of the genus Perityle

ZipcodeZoo has pages for 102 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

More Info

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Notes

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Contributors

Bisby FA, Roskov YR, Orrell TM, Nicolson D, Paglinawan LE, Bailly N, Kirk PM, Bourgoin T, van Hertum J, eds (2008). Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist Taxonomic Classification. CD-ROM; Species 2000: Reading, U.K.
Global Biodiversity Information Facility. Accessed February 16, 2008. http://www.gbif.org Mediated distribution data from provider.
"Perityle saxicola". in Flora of North America Vol. 21 Page 324, 330. Published by Oxford University Press. Online at EFloras.org.

Data Sources

Accessed through GBIF Data Portal February 16, 2008:

USDA PLANTS, USDA PLANTS Database

Identifiers

Biodiversity Heritage Library NamebankID: 2659140
Catalogue of Life Accepted Name Code: ITS-38223
Global Biodiversity Information Facility Taxonkey: 13750403
Globally Unique Identifier: urn:lsid:ipni.org:names:237197-1
Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 38223
Natural Heritage Network Species Identifier: PDAST700P0
U.S.D.A. Plant Symbol: LASA5
Zipcode Zoo Species Identifier: 45265

Footnotes

Sharon C. Yarborough, A. Michael Powell "Perityle". in Flora of North America Vol. 21 Page 317, 333, 334. Oxford University Press. Online at EFloras.org. [back]