The corolla is 2-lipped (upper lip 2-lobed and lower lip 3-lobed), 3/4 to 2 in. long, with 2 woolly ridges running down the open throat; 4 stamens; 2 stigmas. San Juan Loop Trail, Cleveland National Forest, Riverside County, CA. 4-14-12. © Joan Avise

Yellow Monkeyflower
(Wide-throated Yellow Monkeyflower,
Slope Semaphore)

Mimulus brevipes

An erect, slender 4 to 32 in. tall, usually unbranched, sticky, densely hairy annual; occasional to locally common on dry slopes and exposed places and burned areas in coastal sage scrub and chaparral; San Joaquin Hills, mountain foothills, and Santa Ana Mountains (Roberts). Flowering April -  June. 

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Showy lemon yellow flowers with a wide, open throat, are on short stems from leaf axils. There are two flowers per node (Clarke). The plant behind the monkeyflower is Drymocallis (Potentilla) glandulosa. San Juan Loop Trail, Cleveland National Forest, Riverside County, CA. 4-14-12. © Joan Avise

The woolly calyx is 5-cleft, with green (or reddish) ridges with lighter spaces in between, and lower lobes shorter than the upper. San Juan Loop Trail, Cleveland National Forest, Riverside County, CA. 4-14-12. © Joan Avise

The lower ovate leaves are alternate on 2-3 in. long stems. Upper 2 in. leaves are opposite and spaced apart, linear to lance-shaped, with very short or no stem.  San Juan Loop Trail, Cleveland National Forest, Riverside County, CA. 4-14-12. © Joan Avise

San Juan Loop Trail, Cleveland National Forest, Riverside County, CA. 4-14-12. © Joan Avise