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Vascular Plants of California
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Ageratina shastensis
SHASTA AGERATINA


Higher Taxonomy
Family: Asteraceae (Compositae)View DescriptionDichotomous Key
Common Name: SUNFLOWER FAMILY
Habit: Annual to tree. Leaf: basal and/or cauline, alternate, opposite, rarely whorled, simple to 2+ × compound. Inflorescence: 1° inflorescence a head, resembling a flower, of several types (see below), 1--many in generally +- cyme-like cluster; each head generally with +- calyx-like involucre of 1--many series of phyllaries (involucre bracts); receptacle of head flat to conic or columnar, paleate (bearing paleae = receptacle bracts) or epaleate; flowers 1--many per head. Flower: bisexual, unisexual, or sterile, +- small, of several types (see below); calyx 0 or modified into +- persistent pappus of bristles, scales, and/or awns; corolla radial or bilateral (0), lobes generally (0)3--5; stamens 4--5, filaments generally free, generally fused to corolla at tube/throat junction, anthers generally fused into cylinder around style, anther base generally rounded or cordate (deeply sagittate or with tail-like appendages), tip (= flattened appendage) generally projecting beyond pollen sac; pistil 1, 2-carpeled, ovary inferior, 1-chambered, 1-seeded, placenta basal, style 1, tip generally +- 2-branched (except in some staminate disk flowers), branch tips truncate or generally bearing +- brush-like appendages; stigmas 2, generally on adaxial faces of style branches. Fruit: achene (also called a cypsela) (drupe in Chrysanthemoides), cylindric to ovoid, sometimes compressed, generally deciduous with pappus attached.
Genera In Family: +- 1500 genera, 23000 species: worldwide, many habitats. Note: Flower and head types differ in form and sexual condition. A disk flower has a generally radial corolla, with a cylindric tube, expanded throat, and generally 5 lobes. Disk flowers are generally bisexual and fertile but occasionally staminate with reduced ovaries. Discoid heads comprise only disk flowers. A radiant head is a variant of a discoid head, with peripheral disk flower corollas expanded, often bilateral. A ray flower corolla is bilateral, generally with a slender tube and flattened petal-like ray (single lip composed of generally 3 lobes). Ray flowers are generally pistillate or sterile (occasionally lacking styles). Radiate heads have peripheral ray flowers and central disk flowers. Disciform heads superficially resemble discoid heads, with pistillate or sterile flowers that lack rays, together with or separate from disk flowers. A ligulate flower is bisexual, with a bilateral, generally ephemeral corolla and 5-lobed ligule. Liguliflorous heads comprise only ligulate flowers. See glossary p. 31 for illustrations of family characteristics. Echinops sphaerocephalus L., Gaillardia aristata Pursh, Gaillardia pulchella Foug., Hymenothrix loomisii S.F. Blake, Tagetes erecta L., Thelesperma megapotamicum (Spreng.) Kuntze are waifs. Melampodium perfoliatum Kunth, historic urban waif. Ageratum conyzoides L., Guizotia abyssinica (L. f.) Cass., Santolina chamaecyparisus L., orth. var. are rare or uncommon escapes from cultivation. Dyssodia papposa, Ismelia carinata (Schousb.) Sch. Bip. [Chrysanthemum carinatum Schousb.], Mantisalca salmantica (L.) Briq. & Cavill. are historical or extirpated waifs in California. Inula helenium L. not documented in California. Taxa of Aster in TJM (1993) treated here in Almutaster, Eucephalus, Eurybia, Ionactis, Oreostemma, Sericocarpus, Symphyotrichum; Chamomilla in Matricaria; Bahia in Hymenothrix; Cnicus in Centaurea; Conyza in Erigeron and Laennecia; Dugaldia in Hymenoxys; Erechtites in Senecio; Hymenoclea in Ambrosia; Lembertia in Monolopia; Osteospermum ecklonis in Dimorphotheca; Picris echioides in Helminthotheca; Prionopsis in Grindelia; Raillardiopsis in Anisocarpus and Carlquistia; Schkuhria multiflora in Picradeniopsis; Trimorpha in Erigeron; Venidium in Arctotis; Whitneya in Arnica. Amauriopsis in TJM2 (2012) treated here in Hymenothrix; Arida in Leucosyris; Bahia in Picradeniopsis.
Unabridged Note: Largest family of vascular plants in California and of eudicots globally.
eFlora Treatment Author: David J. Keil, except as noted
Scientific Editor: David J. Keil, Bruce G. Baldwin.
Genus: AgeratinaView DescriptionDichotomous Key


Common Name: SNAKEROOT
Habit: Perennial herb, subshrub [shrub]. Leaf: cauline, opposite or distal alternate, petioled; blade elliptic to triangular, entire or toothed, generally 3-veined from base. Inflorescence: heads discoid, 1 or in +- flat-topped cyme-like clusters; involucre bell-shaped, phyllaries +- equal, in 1--2(3) series, linear to narrowly lanceolate; receptacle flat to conic, epaleate. Flower: 10--60; corolla +- white to pink-tinged or lavender, cylindric (or throat wider); style branches linear. Fruit: 5-angled, generally 5-ribbed; pappus of 5--40 slender scabrous bristles, often easily detached.
Species In Genus: +- 250 species: North America to South America. Etymology: (Latin: resembling Ageratum)
eFlora Treatment Author: David J. Keil
Reference: King & Robinson 1987 Monogr Syst Bot Missouri Bot Gard 22:428--436; Nesom 2006 FNANM 21:547--553
Unabridged Reference: Nesom 2006 FNANM 21:547--553
Ageratina shastensis (D.W. Taylor & Stebbins) R.M. King & H. Rob.
NATIVE
Habit: Perennial herb; caudex woody. Stem: 1.3--4.5 dm, erect or ascending, glandular-hairy. Leaf: proximal opposite, distal alternate; blade 15--30 mm, +- deltate-ovate, serrate, +- hairy, abaxially glandular. Inflorescence: heads generally 1(3), +- 1.2 cm; phyllaries glabrous to glandular-hairy. Flower: corolla white. Fruit: 3--5.5 mm. Chromosomes: 2n=34.
Ecology: Limestone or metavolcanic cliffs, chaparral, conifer forest; Elevation: 400--1800 m. Bioregional Distribution: KR. Flowering Time: Jun--Oct
Synonyms: Eupatorium shastense D. Taylor & Stebbins
Jepson eFlora Author: David J. Keil
Reference: King & Robinson 1987 Monogr Syst Bot Missouri Bot Gard 22:428--436; Nesom 2006 FNANM 21:547--553
Unabridged Reference: Nesom 2006 FNANM 21:547--553
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Listed on CNPS Rare Plant Inventory

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Botanical illustration including Ageratina shastensis

botanical illustration including Ageratina shastensis

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Citation for this treatment: David J. Keil 2012, Ageratina shastensis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=767, accessed on May 22, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on May 22, 2019.

Ageratina shastensis
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© 2011 Len Lindstrand III
Ageratina shastensis
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© 2017 Julie Kierstead Nelson
Ageratina shastensis
click for enlargement
© 2017 Julie Kierstead Nelson
Ageratina shastensis
click for enlargement
© 2017 Julie Kierstead Nelson
Ageratina shastensis
click for enlargement
© 2017 Julie Kierstead Nelson
Ageratina shastensis
click for enlargement
© 2017 Julie Kierstead Nelson

More photos of Ageratina shastensis in CalPhotos



Geographic subdivisions for Ageratina shastensis:
KR.
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(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).





 

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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.