Lavenderleaf Sundrops - Calylophus lavandulifolius

 This bright flower in the Evening Primrose Family (Onagraceae) has one of the best common names I've heard: lavenderleaf sundrops (Calylophus lavandulifolius). It grows in gravels from the Plains States west to Nevada.

 Flowers are one to two inches across and bright yellow. As they fade, they turn pinkish or purplish.

For more info about lavenderleaf sundrops, click here.