Perennial Rockcress
Arabis perennans
Intense sunshine has bleached these empty seed pods (siliques) as they remain attached to the flowering stalk some three months after they had flowered in August. Observed in the foothills of Four Peaks, eastern Maricopa Co., Arizona, Nov., 2008.
FLOWERS: Small purple flowers are borne on tall, slender stalks that can
reach almost 2 meters tall. Each flower
has four small lavender or purple petals. Six stamens. Flowers in spring and
again in fall depending on summer rains - the flowers fade quickly so normally
there's just a few open flowers at a time at the top of the inflorescence.
PERENNIAL HERB: Mostly herbaceous above a rather stout and woody caudex
from which new growth emerges each season.
LEAVES: Lance-shaped leaves are alternate on the stems, but crowded near
base. Leaf margins are broadly toothed and the surfaces are disposed with stiff
hairs.
RANGE: Found on upper slopes in the desert mountains as well as in
transition to chaparral and piñon/juniper habitats. More common at the
higher elevations. Also found from California to Texas.
FRUIT: Long, flattened pods.
UNARMED.