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Perityle emoryi

(Emory Rockdaisy)

Overview

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Interesting Facts

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Common Names

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Common Names in English:

Emory Rockdaisy, Emory´s Rock-Daisy, Emory's Rock Daisy, Emory's Rockdaisy, Emory's Rocklily, Emorys Rock Daisy

Description

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Family Compositae

The largest family of flowering plants , the Compositae (Asteraceae), comprising about 1,100 genera and more than 20,000 species and characterized by many small flowers arranged in a head looking like a single flower and subtended by an involucre of bracts. A head may consist of both ray flowers and disk flowers, as in the sunflower, of disk flowers only, as in the burdock, or of ray flowers only, as in the dandelion.

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 emoryi

Annuals (sometimes persisting), 2-60 cm (delicate or robust , stems relatively few to many, erect or spreading ) ; puberulent to hirsute , glandular-pubescent . Leaves: petioles 3-45 mm; blades ovate , cordate, suborbiculate, or triangular, 17-60 × 10-50 mm, margins deeply toothed , lobed , cleft , or divided , lobes indented to irregularly dissected . Heads borne singly or in corymbiform arrays, 4-10 × 4-10 mm. Peduncles 1-70 mm. Involucres campanulate to hemispheric . Phyllaries 10-20, lanceolate or oblanceolate to ovate-lanceolate, 4-6 × 1-2 mm. Ray florets usually 8-14, rarely rudimentary or 0; corollas white, laminae oblong , 1-4(-6) × 1-3 mm. Disc florets 40-100+; corollas yellow, tubes 0.7-1.3 mm, throats tubular to tubular-funnelform, 0.8-1.3 mm, lobes 0.1-0.2 mm. Cypselae suboblong, oblanceolate, or subcuneate, (1.5-) 2-3 mm, margins thin (not calloused), long- or short-ciliate; pappi 0 or of 1 antrorsely to retrorsely barbellate bristles 1-3 mm plus crowns of hyaline , laciniate scales . 2n = 65-72 or 100-116. Flowering year round (depending on latitude ). [source]

Perityle emoryi is a widespread polyploid of diverse habitats and is often weedy. It is variable; none of the variation appears to have population significance and does not require taxonomic recognition. The range of P. emoryi appears to be gradually expanding. [source]

Habit: Forb/herb

Flowers: Bloom Period: January, February, March, April, May, June, July, August, September, October, November, December. • Flower Color: near white, white, yellow

Size/Age/Growth

Size: 6-12" tall.

Habitat

Coastal bluffs , desert plains , slopes , washes; 10-1500 m [2].

Typically found at an altitude of 0 to 1,966 meters (0 to 6,450 feet).[3]

Biology

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Reproduction

Duration: Annual

Growth

Culture: Space 15-18" apart.

Soil: Minimum pH: 6.1 • Maximum pH: 7.8

Sunlight: Sun Exposure: Full sun .

Moisture: Drought Tolerance: High

Temperature: Cold Hardiness: 9a, 9b, 10a, 10b, 11. (map)

Taxonomy

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Synonyms

Perityle emoryi var. nuda (Torr.) Gray

Notes

Name Status: Accepted Name .

Comment: Data Providers: CONABIO, IPNI, Tropicos. GCC LSID: urn :lsid:compositae.org:names:C167227B-C44C-4B1B-9438-A9689F805359

Last scrutiny: 15-Aug-09

Similar Species

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Members of the genus Perityle

ZipcodeZoo has pages for 55 species, subspecies, varieties, forms, and cultivars in this genus:

P. aglossa (Bluff Rock Daisy) · P. ajoensis (Ajo Rock-Daisy) · P. ambrosiifolia (Lace-Leaf Rock Daisy) · P. angustifolia (Narrow-Leaved Rockdaisy) · P. bisetosa (Two-Spike Rock Daisy) · P. bisetosa var. appressa (Twobristle Rockdaisy) · P. bisetosa var. bisetosa (Twobristle Rockdaisy) · P. bisetosa var. scalaris (Twobristle Rockdaisy) · P. californica (California Rock Daisy) · P. cernua (Nodding Rock Daisy) · P. ciliata (Ciliate Rockdaisy) · P. cinerea (Gray Rock Daisy) · P. cochisensis (Cochise Rock Daisy) · P. congesta (Compact Rock Daisy) · P. coronopifolia (Arizona Rockdaisy) · P. dissecta (Dissected Rockdaisy) · P. emoryi (Emory Rockdaisy) · P. fosteri (Foster's Rock-Daisy) · P. gilensis (Fish Creek Rockdaisy) · P. gilensis var. gilensis (Fish Creek Rockdaisy) · P. gilensis var. salensis (Salt River Rockdaisy) · P. gracilis (Grass Leaf Rock Daisy) · P. huecoensis (Hueco Mountains Rockdaisy) · P. incana (Perityle) · P. intricata (Delicate Rock-Daisy) · P. inyoensis (Inyo Rock Daisy) · P. lemmonii (Lemmon's Rock-Daisy) · P. lindheimeri (Bluffdaisy) · P. lindheimeri var. halimifolia (Lindheimers Rockdaisy) · P. lindheimeri var. lindheimeri (Lindheimer's Rockdaisy) · P. megalocephala (Bighead Rockdaisy) · P. megalocephala var. megalocephala (Limestone Rockdaisy) · P. megalocephala var. oligophylla (Small-Leaved Rockdaisy) · P. microglossa (Mazanilla Bronca) · P. microglossa var. microglossa (Shortray Rockdaisy) · P. microglossa var. saxosa (Shortray Rockdaisy) · P. parryi (Heartleaf Rockdaisy) · P. quinqueflora (Five Flower Rock Daisy) · P. rupestris (Leafy Rockdaisy) · P. rupestris var. albiflora (Leafy Rockdaisy) · P. rupestris var. rupestris (Leafy Rockdaisy) · P. saxicola (Fish Creek Rock Daisy) · P. specuicola (Alcove Rockdaisy) · P. stansburii (Standbury's Rockdaisy) · P. stansburyi (Stansbur's Rockdaisy) · P. staurophylla (New Mexico Rockdaisy) · P. staurophylla (Barneby) Shinners var. homoflora T.K. Todsen (New Mexico Rockdaisy) · P. staurophylla var. homoflora (New Mexico Rockdaisy) · P. staurophylla var. staurophylla (New Mexico Rockdaisy) · P. tenella (Springdale Rockdaisy) · P. turneri (Turner's Rockdaisy) · P. vaseyi (Margined Rockdaisy) · P. villosa (Hanaupah Laphamia) · P. vitreomontana (Glass Mountain Rockdaisy) · P. warnockii (River Rock-Daisy)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal November 19, 2007:

Identifiers

Footnotes

  1. 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]
  2. "Perityle emoryi". in Flora of North America Vol. 21 Page 321, 322. Oxford University Press. Online at EFloras.org. [back]
  3. Mean = 607.970 meters (1,994.652 feet), Standard Deviation = 533.680 based on 188 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012