Castilleja exserta
(A. A. Heller) Chuang and Heckard
Purple Owl’s-clover (syn. Orthocarpus purpurascens)
Family: Scrophulariaceae
Habit:
Annual 10 to 45 cm., stiff hairy with purple flowers.
Distribution: Open
fields, grasslands and woodlands of the Northwest, Sierra Nevada
Foothills, coastal areas and inland through mountains of
southern California, the
Channel Islands,
Arizona, and New Mexico.
Seed unit:
Free seed.
Seed: 1
to 2 mm. free seed often has a loose, membranous, net-like outer
seed coat, inner seed coat surface with cellular reticulation.
Embryo:
Embryo is linear to spatulate in fleshy endosperm.
Purity
instructions: Pure seed definition:
AOSA: PSU #1 – Seed, with or without
seed coat/netted covering; broken seed larger than one-half the
original size.
Lab notes:
If ovoid capsule is found, seeds must be removed. Empty seed
coat “nets” are considered inert.
Average
pure seed units per gram: 13,744 seeds per gram (based on AOSA pure seed units only
from 50 samples received for testing from 1995 to 2002).
Range of
percent pure seed: 17% to 93%
Range of
percent inert: 6% to 82%
Description of inert: Plant material, dead insects.
Planting
instructions: 400 seeds, TB, 21 days @ 20°C; for fresh and dormant seed,
prechill and GA3 recommended.
References:
(link
to main reference page)
Hickman, J.C., Ed. 1993. p. 1020
Ransom Seed Laboratory
