(Jepson) Chuang & Heckard
Castilleja rubicundula is a species of Indian paintbrush known by the common name cream sacs.
Castilleja rubicundula is a hairy, glandular annual growing to about half a meter in height, the stem leafy with lance-shaped foliage.
It produces a terminal inflorescence and sometimes branches off several more inflorescences. The white, pink, yellow, or bicolored flowers are divided into usually three pouches, making them look inflated. Each pouch is about a centimeter wide and half a centimeter deep. Each flower has a beak extending about half a centimeter above the pouches.
The fruit is a capsule containing tiny seeds less than a millimeter long. Under magnification the seed's honeycomb-patterned coat is visible.
Subspecies and varieties include:
- Castilleja rubicundula ssp. lithospermoides
- Castilleja rubicundula ssp. rubicundula — endemic to the Sacramento Valley, California.
- Castilleja rubicundula var. rubicundula
- Calflora Database: Castilleja rubicundula (cream sacs)
- Jepson Manual eFlora treatment of Castilleja rubicundula
- USDA Plants Profile for Castilleja rubicundula (cream sacs)
- UC Photos gallery — Castilleja rubicundula
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