Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon

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. Seed: appendage generally 0 (present in Moehringia).
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.
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 & Richard K. Rabeler
Reference: Hartman 2005 FNANM 5:46--47
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Achyronychia
Next taxon: Agrostemma

Name Search

Botanical illustration including Achyronychia cooperi

botanical illustration including Achyronychia cooperi


Citation for this treatment: Ronald L. Hartman & Richard K. Rabeler 2012, Achyronychia cooperi, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on January 24, 2021.

Citation for the whole project: Jepson Flora Project (eds.) 2021, Jepson eFlora,, accessed on January 24, 2021.

Achyronychia cooperi
click for enlargement
© 2015 Keir Morse
Achyronychia cooperi
click for enlargement
© 2010 Neal Kramer
Achyronychia cooperi
click for enlargement
© 2008 Christopher L. Christie
Achyronychia cooperi
click for enlargement
© 2009 Keir Morse
Achyronychia cooperi
click for enlargement
© 2015 Keir Morse
Achyronychia cooperi
click for enlargement
© 2017 California Academy of Sciences

More photos of Achyronychia cooperi in CalPhotos

Geographic subdivisions for Achyronychia cooperi:
1. You can change the display of the base map and layers by clicking on the layer control box in the upper right-hand corner.
2. California county polygons can be turned off and on in the layer control box.
3. Filling of Jepson subdivision polygons can be turned off and on in the layer control box.
4. Moving the cursor over any numbered cluster will show the range boundary of the included specimens (with a blue polygon).
5. Marker clustering can be turned off by clicking this link:      Marker Clustering OFF
WARNING: Turning this off might cause maps with large numbers of specimens to load slowly.
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).


View elevation by latitude chart

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

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).