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annual agoseris, annual false dandelion, mountain dandelion

Photo is of parent taxon

Arizona agoseris

Habit Annuals.
Stems

0 or 1 (erect, 0–5 cm).

0.

Leaves

mostly erect, sometimes prostrate;

petioles not purplish, margins glabrous or ciliate;

blades usually oblanceolate to spatulate, rarely linear, 1–25 cm, margins entire or lobed;

lobes 2–3 pairs, linear to spatulate, spreading to antrorse, lobules mostly 0, glabrous or densely hairy.

spreading to prostrate;

blades 2–12 cm × 3–9(–12) mm, mostly lobed, lobes 2–3 pairs, abaxially glabrous, adaxially pubescent.

Peduncles

elongating after flowering, 3–60 cm in fruit, glabrous or glabrate, or basally puberulent and apically hairy to tomentose, sometimes stipitate-glandular.

0–26 cm, lengths mostly less than 0.5 times leaves at flowering, 0.5–3 times leaves in fruit, ± glabrate, or apically tomentose.

Involucres

cylindric to hemispheric, 1–2 cm in fruit.

Receptacles

epaleate.

Florets

5–100(–300);

corollas yellow, tubes 1–5 mm, ligules 2–15 × 1–3 mm;

anthers 1–4 mm.

15–30+;

corollas ± equaling phyllaries at flowering, tubes 2–3 mm, ligules 2–3 × 0.8–1.5 mm;

anthers ca. 1 mm.

Phyllaries

in 2–3 series, green or medially rosy purple, sometimes purple-black spotted or tipped, subequal to unequal, margins glabrous or ciliate, faces usually puberulent to villous, mostly stipitate-glandular, sometimes glabrous;

outer erect or spreading, adaxially usually villous to lanate, sometimes glabrous;

inner erect, ± elongating after flowering.

Cypselae

7–16 mm, bodies mostly fusiform to obconic, sometimes tumid, 2–5(–10) mm, beaks 5–11 mm, lengths 1–4 times bodies, ribs 0 or alate, straight to strongly undulate, uniform or diminishing proximally;

pappus bristles in 2–3 series, 4–9 mm.

Agoseris heterophylla

Agoseris heterophylla var. quentinii

Phenology Flowering Mar–Jun.
Habitat Mesic to dry habitats in deserts, grasslands, and oak woodlands
Elevation 1200–2000 m (3900–6600 ft)
Distribution
from FNA
AZ; CA; ID; MT; NM; NV; OR; UT; WA; BC; nw Mexico (including Guadalupe Island) [Introduced in Europe (Sweden)]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

The relatively small corollas and anthers of var. quentinii suggest that it, too, may be autogamous, as is var. heterophylla.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Ligules 10–15 mm, much surpassing phyllaries; anthers 2–4 mm; leaf blades toothed to lobed, lobes mostly 3–4(–5) pairs
var. cryptopleura
1. Ligules 2–4 mm, subequaling phyllaries; anthers 1–1.5 mm; leaf margins entire, toothed, or lobed, lobes mostly 2–3 pairs
→ 2
2. Peduncle lengths 0.5–3 times leaves at flowering; leaf blades glabrous abaxially, pubescent adaxially; peduncles mostly glabrate, or apically tomentose
var. quentinii
2. Peduncle lengths mostly 1.5–4.5 times leaves at flowering; leaf blades uniformly glabrous or hairy; peduncles ± glabrate, or apically hairy to villous, sometimes glabrous
var. heterophylla
Source FNA vol. 19, p. 332. FNA vol. 19, p. 334.
Parent taxa Asteraceae > tribe Cichorieae > Agoseris Asteraceae > tribe Cichorieae > Agoseris > Agoseris heterophylla
Sibling taxa
A. apargioides, A. aurantiaca, A. glauca, A. grandiflora, A. hirsuta, A. monticola, A. parviflora, A. retrorsa, A. ×elata
A. heterophylla var. cryptopleura, A. heterophylla var. heterophylla
Subordinate taxa
A. heterophylla var. cryptopleura, A. heterophylla var. heterophylla, A. heterophylla var. quentinii
Synonyms Macrorhynchus heterophyllus
Name authority (Nuttall) Greene: Pittonia 2: 178. (1891) G. I. Baird: Sida 21: 271. (2004)
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