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Kallstroemia species [Zygophyllaceae]

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Scientific Name Kallstroemia grandiflora USDA PLANTS Symbol KAGR
Common Name Arizona Poppy, Orange Caltrop ITIS Taxonomic Serial No. 29044
Family Zygophyllaceae (Caltrop) SEINet
Reference
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Description Habitat: Desert environments; flat areas with gravelly or sandy soils; below 5,000 ft.
Plant: Annual with decumbent to ascending stems 4 to 40 inches long in spreading clumps 2 to 5 feet across in favorable environments; stems densely covered with hairs.
Leaves: Pinnately-compound, 5/8 to 2-3/4 inches long with 4 to 8 pairs of elliptic leaflets, 1/3 to 1 inch long, on each side of the midrib, somewhat hairy.
Inflorescence: Deep dark orange flowers fading to yellow during the day, up to 2-1/2 inches across, with 5 petals, 5 sepals and 10 stamens with yellow anthers; on peduncles 1 to 4 inches long.
Bloom Period: May to November.
References: Wildflower Center, Flora of North America, SEINet, and "Manual of the Vascular Plants of Texas" by Correll and Johnston.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Kallstroemia parviflora USDA PLANTS Symbol KAPA
Common Name Warty Caltrop ITIS Taxonomic Serial No. 29047
Family Zygophyllaceae (Caltrop) SEINet
Reference
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Description Habitat: Dry soils in disturbed areas, grasslands, slopes and flats from 1,000-5,000 ft.
Plant: Annual with prostrate to decumbent or ascending branches, up to 40 inches long, mostly hairy with coarse and smaller appressed hairs.
Leaves: Even-pinnately-compound, 5/8 to 2-3/4 inches long overall with 3 to 5 pairs of elliptic to oblong leaflets, 1/3 to 3/4-inch long; lower surfaces hairy, upper, smooth; veins and edges covered with fine silky hairs; linear-lanceolate stipule at base of leaf 1/4-inch long or less.
Inflorescence: Orange flowers, drying to white or yellow, 3/8 to 1-inch across; petals narrowly obovate to spatulate; yellow anthers (red in the images here); cylinder-shaped style hairy or smooth; hairy lanceolate sepals about 2/3 the length of petals are persistent, lasting through fruit stage.
Bloom Period: August to October
References: "Wildflowers of Texas" by Michael Eason, SEINet and Flora of North America.
BONAP Distribution Map

Texas Status:
Native

© Tom Lebsack 2022