Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Ronald L. Hartman (except Silene)

Annual, biennial, perennial herb, rarely dioecious, taprooted or rhizome generally slender
Leaves simple, generally opposite; stipules generally 0; petiole generally 0; blade entire, sheath generally 0
Inflorescence: cyme, generally open; flowers few–many or flower solitary and axillary; involucre generally 0
Flower generally bisexual, radial; hypanthium sometimes present; sepals generally 5, ± free or fused into a tube, tube generally herbaceous between lobes or teeth; awns generally 0; petals generally 5 or 0, generally tapered to base (or with claw long, blade expanded), entire to 2–several-lobed, blade generally without scale-like appendages (inner surface), generally without ear-like lobes at base; stamens generally 10, generally fertile, generally free, generally from ovary base; nectaries generally 0; ovary superior, generally 1-chambered, placentas basal or free-central, styles 2–5 or 1 and 2–3-branched
Fruit: capsule or utricle (rarely modified, dehiscent), generally sessile
Seeds: appendage generally 0
Genera in family: 85 genera, 2400 species: widespread, especially arctic, alpine, temp, n hemisphere; some cultivated (Agrostemma, Arenaria, Cerastium, Dianthus, Gypsophila, Lychnis, Saponaria, Silene, Vaccaria ).


Species in genus: 1 sp
Etymology: (Greek: chaff fingernail, from silvery, chaffy sepals)


A. cooperi Torr. & A. Gray


Annual, prostrate to ascending, glabrous to ± hairy, taprooted
Stems many, 3–17 cm
Leaf: stipules 0.1–0.4 mm, ± ovate, scarious, ± fringed, white; blade 3–20 mm, oblanceolate; vein 1
Inflorescence: cyme, axillary; flowers 20–60+; pedicels 0.5–2.5 mm
Flower 2.5–3 mm; hypanthium 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 1–2, sterile stamens 14–19, ± 0.5 mm, thread-like, arising from hypanthium rim; ovary superior, style 2-branched in upper 1/2, 0.3–0.4 mm
Fruit: utricle, 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: Desert
Distribution outside California: Arizona, Mexico
Flowering time: Jan–May
Closely related to and possibly same as Scopulophila.

previous taxon | next taxon
bioregional map for ACHYRONYCHIA%20cooperi being generated

Retrieve Jepson Interchange Index to Plant Names entry for Achyronychia cooperi
Retrieve dichotomous key for Achyronychia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California