Grew up on it, in fact, long before the primary ingredient for flavor began to be soap-weed. From Wordnik.com. [What does soap taste like? | Homesick Texan] Reference
At length he swung Button in an easy lope toward what looked to be a bunch of soap-weed in the middle distance. From Wordnik.com. [Arizona Nights] Reference
Each excrescence on the plain his half-squinted eyes noticed, and with instant skill relegated to its proper category of soap-weed, mesquite, cactus. From Wordnik.com. [Arizona Nights] Reference
Moreover, while the soap-weed wash at the fisherman's hut had whitened his skin, his face and hands still retained a smoky pallor which would take some time to wear off. From Wordnik.com. [Plotting in Pirate Seas] Reference
To the flower-lover it is the yucca; to the cultivator, or whosoever meddles with its leaves, it is the Spanish-bayonet; to the utilitarian, who values a thing only as it is of use to him, it is the soap-weed -- ignoble name, referring to certain qualities pertaining to its roots. From Wordnik.com. [A Bird-Lover in the West] Reference
"Have you any soap-weed root?". From Wordnik.com. [Plotting in Pirate Seas] Reference
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