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

Crotalaria spectabilis

Crotalaria pallida

rattlebox, showy crotalaria, showy rattlebox

salts rattlebox, smooth crotalaria, smooth rattlebox, striped crotalaria
Habit Herbs annual.
Stems

suffrutescent basally, erect, 50–150 cm, glabrous.

Leaves

unifoliolate;

stipules ovate to ovate-lanceolate, not decurrent on stem, 4–7 mm;

blade obovate to elliptic, 50–150 mm, length 1.5–2.5 times width, surfaces glaucous, strigose abaxially, glabrous-punctate adaxially.

Racemes

12–22-flowered, terminal, subterminal, or lateral, 10–50 cm;

bracts persistent, cordate-auriculate, 5–8 mm.

Flowers

calyx broadly cylindrical, 10–15 mm, lobes triangular-lanceolate, glabrous;

corolla bright yellow, faintly red-lined, 17–25 mm.

Legumes

30–45 × 10–20 mm, glabrous.

2n

= 16.

Crotalaria spectabilis

Crotalaria pallida
Phenology Flowering (Jan–)Aug–Oct (year-round).
Habitat Grassy or fallow fields, roadsides, ditches, borrow pits, lake edges, disturbed areas.
Elevation 10–200 m. [30–700 ft.]
Distribution
map from FNA
AL; AR; FL; GA; IL; LA; MD; MO; MS; NC; SC; TN; TX; VA; Asia [Introduced in North America; introduced also in Mexico, West Indies, Central America, South America, Indian Ocean Islands (Reúnion), Pacific Islands]
[WildflowerSearch map]
[BONAP county map]
map from USDA
Africa [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

In Texas, Crotalaria spectabilis is known from Brazos, Cameron, Karnes, and Liberty counties.

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

Varieties 2 (1 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Parent taxa Fabaceae > subfam. Faboideae > Crotalaria Fabaceae > subfam. Faboideae > Crotalaria
Sibling taxa
C. avonensis, C. incana, C. juncea, C. lanceolata, C. ochroleuca, C. pallida, C. pumila, C. purshii, C. retusa, C. rotundifolia, C. sagittalis, C. trichotoma, C. verrucosa, C. virgulata
C. avonensis, C. incana, C. juncea, C. lanceolata, C. ochroleuca, C. pumila, C. purshii, C. retusa, C. rotundifolia, C. sagittalis, C. spectabilis, C. trichotoma, C. verrucosa, C. virgulata
Subordinate taxa
C. pallida var. obovata
Synonyms C. retzii
Name authority Roth: Nov. Pl. Sp., 341. (1821) Aiton: Hort. Kew. 3: 20. (1789)
Source FNA vol. 11. Treatment author: Guy L. Nesom. FNA vol. 11. Treatment author: Guy L. Nesom.
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 Boraginaceae and Polemoniaceae.)

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