62 LOASACEA. (MENTZELIA FAMILY.) 
sometimes unequal lobes. Capsule linear, 4-angled. Annuals, with erect brittle stems 
and alternate leaves on short petioles. 
1..C. elegans, Dougl. Stems from 6 inches to 6 feet high; leaves broadly ovate to 
linear, repandly toothed; petals rhomboidal; stigma-lobes equal; capsule nearly sessile. 
2. ©. rhomboidea, Dougl. Is smaller; leaves petioled; claws of the petals 
toothed; capsule short, pediceled. 
7. HUCHARIDIUM, Fisch. & Mey. 
Distinguished from Clarkia by the filiform calyx tube prolonged above the ovary, and 
stamens only 4. : 
1. HE. concinnum, Fisch. & Mey. Closely resembles Clarkia rhomboidea in habit 
and foliage, calyx-tube an inch long; petals 3-lobed. Common. 
8. BOISDUVALIA, Spach. 
Petals 4, obovate-cuniform, sessile, 2-lobed, purple to white. Anthers not versatile.— 
Leaves alternate, simple, sessile; the small flowers in leafy spikes; our species villous. 
1, B. densiflora, Wat. Canescent; 6 inches to:2 ft. high; leaves lanceolate to 
linear-lanceolate, mostly denticulate, 1 to 3 inches long; the floral leaves usually short 
and broad; flowers in usually a close terminal leafy spike or numerous short lateral spike- 
lets; petals 3 to 6 lines long. : 
2. B. Torreyi, Wat. Rather slender, a span or two high; leaves 4 to 9 lines long; 
the floral leaves scarcely smaller; flowers very small. 
9. Girczea, Pacifica, Asch. & Magn. In moist woods. Distinguished by its small 
indehiscent pear-shaped fruit covered with bristles and thin ovate opposite leaves. 
Onrvrer 25. LOASACEA. 
Herbaceous plants with either stinging or jointed and rough-barbed hairs; no stipules, 
calyx tube adnate to the l-celled ovary. Stamens usually very numerous. 
1, MENTZELIA, L. 
Calyx cylindrical to ovoid; the persistent limb 5-toothed. Petals 50r10. Stamens 
numerous, inserted below the petals on the throat of the calyx; filaments free or in clus- 
ters opposite the petals, filiform or the outer petaloid. Style 3-cleft, the lobes often 
twisted.—The leaves are alternate, mostly coarsely-toothed or pinnatifid; flowers white 
to yellow or orange. (See ADDENDA.) 
1. M. albicaulis, Dougl. Slender, 6 to 12 inches high or more; leaves linear-lance- 
olate, pinnatifid with numerous narrow lobes, the upper leaves broader and often lobed 
