Tendrils used for anchoring the plant grow opposite the leaves. The male and female flowers are separate but on the same plant, and are white with five petals.
The fruit is a green, ovoid gourd to 5" long densely covered with stiff flattened prickles sometimes with a sharp beak at the end and containing 4-16 oblong brown to tan seeds.
Wild cucumber begins sending up rapidly-growing shoots in December and may begin blooming in January, continuing through April. It is a common plant of dry areas of chaparral, washes, roadsides below 3000' and may also be found in coastal sage scrub and foothill woodland communities.
What I really wanted to know though, is why is it called a cucumber when it really doesn't look like one, and is it edible? I'll find out and get back to you.