Plant: annual; stem ascending to erect, 4-25 cm. Leaves: generally alternate, generally 0.5-4 cm, ± linear, strigose to sharp-bristled. INFLORESCENCE: cymes; pedicels in fruit 2.5-4 mm, generally free from nutlets, generally recurved. Flowers: sepals generally < fruit, upper 2 in fruit generally > others; corolla 0.8-3 mm, white; style attached to receptacle, unbranched, generally persistent, stigma 1, head-like. Fruit: nutlets 4, slightly to moderately recurved ± throughout, 2.5-4.5 mm, oblanceolate to narrowly obovate; margin teeth fused at base, width at base ± = length, marginal prickles hooked at tip, not barbed. Misc: Washes, roadsides in creosote-bush scrub, Joshua-tree woodland; 150-1500 m.; Mar-May.

Santa Catalina Mountains
Sabino Canyon Recreation Area
Location: Esperero Trail 50 ft from road to volunteers' camp
3/1/17

Notes: Sabino Canyon beside Bear Canyon Road 3/8/16
Junction of Esperero/Rattlesnake Canyon Trails 3/29/17

See SEINet Pictures and Description