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Vascular Plants of California
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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 most 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. Seed: appendage generally 0 (present in Moehringia).
Genera In Family: +- 100 genera, 3000 species: widespread, especially arctic, alpine, temperate northern hemisphere; some cultivated (Agrostemma, Arenaria, Atocion, Cerastium, Dianthus, Gypsophila, Lychnis, Sagina, Saponaria, Silene). Note: Apetalous Caryophyllaceae can also be keyed in Rabeler & Hartman 2005 FNANM 5:5--8. Taxa of Minuartia in TJM2 treated here in Cherleria and Sabulina; Pseudostellaria in Hartmaniella and Torreyostellaria; Vaccaria in Gypsophila; Velezia in Dianthus.
eFlora Treatment Author: Ronald L. Hartman (deceased) & Richard K. Rabeler, except as noted
Scientific Editor: Bruce G. Baldwin & Thomas J. Rosatti.
Genus: AchyronychiaView Description 

Etymology: (Greek: chaff fingernail, from silvery, chaffy sepals) Note: Flower, seed suggest possible unification with Scopulophila.
eFlora Treatment Author: Ronald L. Hartman (deceased) & Richard K. Rabeler
Reference: Hartman 2005 FNANM 5:46--47
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
Jepson eFlora Author: Ronald L. Hartman (deceased) & Richard K. Rabeler
Reference: Hartman 2005 FNANM 5:46--47
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Achyronychia cooperibotanical illustration including Achyronychia cooperi

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Citation for this treatment: Ronald L. Hartman (deceased) & Richard K. Rabeler 2012, Achyronychia cooperi, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on July 23, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on July 23, 2024.

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

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Geographic subdivisions for Achyronychia cooperi:
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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 occurrence).


Data provided by the participants of the  Consortium of California Herbaria.

View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month Flowering-Fruiting Monthly Counts

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).