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Achyronychia cooperi

ONYX FLOWER, FROST-MAT


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
NATIVE
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, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=11813, accessed on July 22, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on July 22, 2024.

Achyronychia cooperi
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©2010 Neal Kramer
Achyronychia cooperi
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©2004 James M. Andre
Achyronychia cooperi
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©2015 Keir Morse
Achyronychia cooperi
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©2008 Christopher L. Christie
Achyronychia cooperi
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©2015 Keir Morse

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Geographic subdivisions for Achyronychia cooperi:
D
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Data provided by the participants of the  Consortium of California Herbaria.

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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.
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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).