Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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CARYOPHYLLACEAE

PINK FAMILY

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 ).

ACHYRONYCHIA


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

Native

A. cooperi Torr. & A. Gray

ONYX FLOWER, FROST-MAT

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.

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bioregional map for ACHYRONYCHIA%20cooperi being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

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
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