Verbesina rothrockii, Rothrock's Crownbeard
Scientific Name: Verbesina rothrockii
Common Name: Rothrock's Crownbeard
Also Called: Rothrock Crownbeard
Family: Asteraceae, Sunflower Family
Synonyms: (Verbesina longipes)
Size: 2 feet
Growth Form: Forb/herb; erect slender reddish stems.
Leaves: Green, bright green; opposite, clasping, rough or like sandpaper; alternate on upper ends of stems, with prominent veins; ovate or elliptic, coarsely toothed and rough.
Flower Color: Yellow; showy golden-yellow solitary radiate heads borne on long stems or peduncles; ray flowers 8 or more, disk flowers numerous, golden colored; fruit is an achene looking similar to a flat sunflower seed.
Flowering Season: May to September.
Elevation: 3,500 to 5,500 feet.
Habitat Preferences: Rocky hillsides and slopes.
Recorded Range: Rothrock’s Crownbeard is rare in the United States where its distribution is limited to south central and south eastern Arizona and in the southwest corner of New Mexico. Rothrock’s Crownbeard is also native to northern and central Mexico.
U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.
Comments: Rothrock’s Crownbeard is a rare sub-tropical pubescent species in the United States where its entire distribution is limited to southern Arizona and southwest New Mexico. Rothrock’s Crownbeard employs a survival strategy known as "perennating" in which a part or parts of a plant rest in a period of quietness or inactivity and cease growing under adverse conditions, drought, cold or excessive heat, with the ability to resume new growth when favorable conditions return.
Also see Golden Crownbeard, Verbesina encelioides.