Senna covesii

Senna covesii A. Gray
Coues’ Cassia, Desert senna (syn. Cassia covesii)

Family:  Fabaceae

Habit:  Subshrub, unarmed, leafy and densely white-hairy; stems 3 to 6 dm.

Distribution:  Dry, sandy desert washes and slopes.  Rare in California. Found in the Sonora Desert, Arizona, Nevada, and Baja California.

Seed unit:  Free seed.

Seed:  Several in flat pods.  Seeds brown, 2 to 4mm., shiny, flattened, irregularly shaped.

Embryo:  Foliar embryo, bent or folded, with hard seed coat.

Purity instructions:   Pure seed definition: 
AOSA:  PSU #2 – Seed with at least a portion of the seed coat attached.  Broken seed larger than one-half the original size with at least a portion of the seed coat attached.

Lab notes:  Samples of this species often contain large percentages of hard seeds; viability of hard seeds can be determined by TZ, or hard seeds can be clipped and chilled with GA3.

Average pure seed units per gram:  44 seeds per gram (based on AOSA pure seed units only from 2 samples received for testing from 1998 to 1999).

Range of percent pure seed:   99%

Range of percent inert:  1%

Description of inert:   Plant material, broken seed.

Planting instructions:  400 seeds, T, 21 days @ 20°C; for fresh and dormant seed, prechill recommended.

References:  (link to main reference page)
Hickman, J.C., Ed.  1993.  p. 644.
Ransom Seed Laboratory