Key to Chrysothamnus

View taxon page for Chrysothamnus

(For a list of species in Chrysothamnus, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Involucre 9–15 mm; fruit glabrous or with few glandular hairs; style appendages ± = stigmatic portion ..... C. depressus

1' Involucre 4–10 mm; fruit moderately to densely hairy; style appendages generally < stigmatic portion

2. Heads generally overtopped by distal leaves; flowers 2–3(4); style branches generally not 

exserted 

Protruding out of surrounding structure(s) (e.g., stamens exserted from corolla).

beyond 

spreading 

Oriented more or less perpendicularly to the axis of attachment; often, more or less horizontal.

 corolla 

lobes 

1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth.

; lower phyllaries leaf-like and >= rest of 

involucre 

Group of bracts more or less held together as a unit, subtending a flower, fruit (acorn cup), or inflorescence.

..... C. humilis

2' Heads not overtopped by distal leaves (occasionally distal may reach into inflorescence but not beyond); flowers 3–5(14); lower phyllaries ± green but << rest of involucre; style branches exserted beyond spreading corolla lobes.

3. Leaves thread-like, 0.5–2 mm wide; phyllary tips 

acuminate 

Having a long-tapered, sharp tip, the sides concave.

to rigidly short-pointed; flowers 4–5 ..... C. greenei

3' Leaves thread-like or 

linear 

Elongate, with nearly parallel sides; narrower than elliptic or oblong.

to 

oblong 

Longer than wide, with nearly parallel sides; wider than linear.

or (ob)lanceolate, 0.5–10 mm wide; phyllary tips 

acute 

Having a short-tapered, sharp tip, the sides convex or straight and converging at less than a right angle.

to 

obtuse 

Having a short-tapered, blunt tip or base, the sides convex or straight and converging at more than a right angle.

or rounded; flowers 3–14 ..... C. viscidiflorus

4. Distal stems and often leaves hairy

5. Stem ± green, bristly hairy; leaves green, 2–6 mm wide, rough-hairy especially abaxially, sometimes glabrous adaxially, 3–5-veined ..... subsp. lanceolatus

5' Stem and leaves gray-green, 

puberulent 

Minutely hairy.

; leaves 1–2(4) mm wide; 1-veined (sometimes 3-veined proximally) ..... subsp. puberulus

4' Stem glabrous; 

leaf 

Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets).

faces glabrous, margins ± 

ciliate 

Having generally straight, conspicuous hairs along margins or edges.

6. Leaves 0.5–1 mm wide; flowers 3–4(5); involucre ± obconic ..... subsp. axillaris

6' Leaves 1–10 mm wide; flowers 4–14; involucre narrowly 

cylindric 

Elongate, with parallel sides and, at any point, round in transverse section.

..... subsp. viscidiflorus

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