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Achyronychia cooperi

Higher Taxonomy
Family: CaryophyllaceaeView DescriptionDichotomous Key

Common Name: PINK FAMILY
Habit: Annual to perennial herb; rarely dioecious (Silene), taprooted or rhizome generally slender. Leaf: simple, generally opposite (subwhorled), entire, pairs at nodes often +- connected at bases; stipules generally 0; petiole generally 0. Inflorescence: generally cyme, generally open; flowers 1--many; involucre generally 0 (present in Dianthus, Petrorhagia). Flower: generally bisexual, radial; hypanthium often present but obscure; sepals (4)5, +- free or fused into a tube, margins generally scarious, more so on inner 2 or not, tube generally not scarious, awns generally 0; petals (4)5 or 0, generally tapered to base (or with claw long, limb expanded), entire to 2--several-lobed, limb generally without scale-like appendages adaxially, generally without ear-like lobes at base; stamens generally 10, generally fertile, generally free, generally from ovary base; nectaries 0 or 5; ovary superior, generally 1-chambered, placentas basal or free-central, styles 2--5 with 0 branches or 1 with 2--3 branches. Fruit: capsule or utricle (rarely +- dehiscent), generally sessile.
Genera In Family: 83 or 89 genera, 3000 species: widespread, especially arctic, alpine, temperate northern hemisphere; some cultivated (Agrostemma, Arenaria, Cerastium, Dianthus, Gypsophila, Lychnis, Sagina, Saponaria, Silene, Vaccaria). Note: Apetalous Caryophyllaceae can also be keyed in Rabeler & Hartman 2005 FNANM 5:5--8.
eFlora Treatment Author: Ronald L. Hartman & Richard K. Rabeler, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: AchyronychiaView Description 

Species In Genus: 1 sp. Etymology: (Greek: chaff fingernail, from silvery, chaffy sepals) Note: Flower, seed suggest possible unification with Scopulophila.

Achyronychia cooperi Torr. & A. Gray
Habit: Annual, prostrate to ascending, glabrous to +- hairy, taprooted. Stem: many, 3--17 cm. Leaf: stipules 0.1--0.2 mm, +- ovate, scarious, +- fringed, white; blade 3--20 mm, oblanceolate, +- fleshy; vein 1. Inflorescence: axillary; flowers 20--60+; pedicels 0.5--2.5 mm. Flower: 2.5--3 mm; hypanthium +- 10-ribbed, in fruit +- cylindric; calyx abruptly expanded above; sepals 5, free, +- 1.2--1.5 mm, ovate to reniform, green, fleshy, margin wide, scarious, +- jagged, white, deciduous; petals 0; fertile stamens 1--4, staminodes 14--19, +- 0.5 mm, thread-like, on hypanthium rim; style 2-branched in upper 1/2, 0.3--0.4 mm. Fruit: utricle, +- dehiscent, ovoid; teeth 8--10, minute. Seed: 1, +- 1 mm, ovoid, +- compressed, tan, red dot near narrow end.
Ecology: Sandy slopes, flats, washes; Elevation: 50--700 m. Bioregional Distribution: D; Distribution Outside California: Arizona, Mexico. Flowering Time: Jan--May
eFlora Treatment Author: Ronald L. Hartman & Richard K. Rabeler
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botanical illustration including Achyronychia cooperi


Citation for this treatment: Ronald L. Hartman & Richard K. Rabeler 2016. Achyronychia cooperi, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 02, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 02, 2016.

Achyronychia cooperi
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© 2009 Keir Morse
Achyronychia cooperi
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© 2015 Keir Morse
Achyronychia cooperi
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© 2010 Neal Kramer
Achyronychia cooperi
click for enlargement
© 2010 Neal Kramer
Achyronychia cooperi
click for enlargement
© 2015 Keir Morse
Achyronychia cooperi
click for enlargement
© 2012 Neal Kramer

More photos of Achyronychia cooperi in CalPhotos

Geographic subdivisions for Achyronychia cooperi:
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.