Flora of North America species comparison

The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Ambrosia cordifolia

Ambrosia ilicifolia

heartleaf bursage, Tucson bur ragweed, Tucson burr ragweed

holly leaf burbush, holly-leaf bur-sage, hollyleaf bur ragweed, hollyleaf burr ragweed
Habit Shrubs, 30–50+ cm. Shrubs, 30–50(–120+) cm.
Stems

erect.

erect.
Leaves

mostly alternate;

petioles 3–35 mm;

blades deltate to rounded-deltate, 10–35(–80) × 10–30(–70) mm, bases cordate to truncate, margins coarsely toothed, abaxial faces densely puberulent (including veins), adaxial faces strigillose to scabrellous and gland-dotted.

mostly alternate;

petioles 0–2 mm;

blades (green) elliptic to ovate, 25–60+ × 12–35+ mm, bases rounded to truncate, margins spiny-toothed, abaxial and adaxial faces ± hirtellous (on veins) and stipitate-glandular.
Staminate heads

peduncles 0–1 mm;

involucres cup-shaped, 2–3(–5) mm diam., strigillose;

florets 8–30+.

peduncles 2–8(–12) mm;

involucres ± saucer-shaped, 9–15+ mm diam., ± hirtellous and stipitate-glandular;

florets 20–40+.
Pistillate heads

clustered, proximal to staminates;

florets (1–)2.

clustered, proximal to staminates;

florets 2.
Burs

bodies ± globose to fusiform, 3–4+ mm, tomentulose and stipitate-glandular, spines 8–20+, scattered, ± subulate (basally navicular), 1–2 mm, tips straight or uncinate.

bodies ± globose, 6–8 mm, stipitate-glandular, spines 40–50+, scattered, subulate, 4–6 mm, tips straight or ± uncinate.
2n

= 36.

Ambrosia cordifolia

Ambrosia ilicifolia
Phenology Flowering Mar–Apr. Flowering Jan–Apr.
Habitat Sandy washes, benches Sandy washes, benches
Elevation 700–1200 m (2300–3900 ft) 30–500 m (100–1600 ft)
Distribution
from FNA
AZ; Mexico (Sinaloa, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 14. FNA vol. 21, p. 12.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia
Sibling taxa
A. acanthicarpa, A. ambrosioides, A. artemisiifolia, A. bidentata, A. chamissonis, A. cheiranthifolia, A. chenopodiifolia, A. confertiflora, A. deltoidea, A. dumosa, A. eriocentra, A. grayi, A. hispida, A. ilicifolia, A. linearis, A. monogyra, A. psilostachya, A. pumila, A. salsola, A. tomentosa, A. trifida
A. acanthicarpa, A. ambrosioides, A. artemisiifolia, A. bidentata, A. chamissonis, A. cheiranthifolia, A. chenopodiifolia, A. confertiflora, A. cordifolia, A. deltoidea, A. dumosa, A. eriocentra, A. grayi, A. hispida, A. linearis, A. monogyra, A. psilostachya, A. pumila, A. salsola, A. tomentosa, A. trifida
Synonyms Franseria cordifolia Franseria ilicifolia
Name authority (A. Gray) W. W. Payne: J. Arnold Arbor. 45: 421. (1964) (A. Gray) W. W. Payne: J. Arnold Arbor. 45: 425. (1964)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



Type/paste one or more Latin names into the boxes above; matching taxa will show up below the box as you type. You can use the up/down arrow keys to move through the list.

(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Apiaceae, Boraginaceae, and Polemoniaceae.)

Choose a data source: Flora of North America

The species comparison tool is brought to you by:
Northwest Wildflowers