Portulacaceous \Por`tu*la*ca"ceous\, a. (Bot.) Of or pertaining to a natural order of plants (Portulacace[ae]), of which Portulaca is the type, and which includes also the spring beauty (Claytonia) and other genera.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Claytonia \Clay*to"ni*a\, n. [Named after Dr.John Clayton, an American botanist.]

(Bot.) An American genus of perennial herbs with delicate blossoms; -- sometimes called spring beauty.

Source: Webster's Revised Unabridged Dictionary (1913)