92 MALVACEAE 



tawny slender-rayed hairs. Leaves orbicular-cordate, the upper often 3-5-lobed, coarsely crenate, 

 2-6 cm long and broad, veins more coarsely scurfy-pubescent on the under surface; petioles 

 stout, 3-18 mm. long ; stipules thin, subulate, 4-5 mm. long ; inflorescence interrupted-spicate or 

 of short-pedunculate axillary clusters; involucellate bractlets linear-lanceolate, 4^6 mm. long, 

 shorter than the calyx-lobes ; calyx densely tomentose with long-rayed stellate hairs, 7-10 mm. 

 long, the lobes triangular-lanceolate, 2>-7 mm. long, 2-A mm. wide; petals obovate, rose-pmk, 

 10-12 mm. long; stamineal column glabrous ; carpels obovate-reniform, about 2 mm. high, densely 

 stellate-pubescent with bright yellow hairs on the summits, glabrous on the backs and sides ; 

 seeds reniform, black, minutely stellate-puberulent. 



Dry slopes, Upper Sonoran Zone; bordering the desert from the Tehachapi Mountains of Kern and Ventura 

 Counties and the eastern slope of the southern Sierra Nevada in Inyo County to the San Bernardino Mountains, 

 California. Type locality: mountains south of Tehachapi, Kern County, California. June-Oct. 



3. Malvastrum Davidsonii Robinson. Davidson's Malvastrum. Fig. 3179. 



Malvastrum Davidsonii Robinson in A. Gray, Syn. Fl. N. Amer. P: 312. 1897. 

 Malacothamnus Davidsonii Greene, Leaflets Bot. Obs. 1 : 208. 1906. 

 Sphaeralcea Davidsonii Jepson, Man. Fl. PI. Calif. 634. 1925. 



An arborescent shrub 2-5 m. high with coarse branches, leaves and inflorescence scurfy with 

 a coarse, thick, stellate tomentum. Leaves thick, orbicular to pentagonal, usually shallowly 3-5- 

 lobed, 2-10 cm. wide and long, cordate, irregularly dentate or crenate, somewhat rugose, both 

 surfaces stellate-tomentose, veiny beneath ; petioles stout, 1-4 cm. long ; inflorescence a pyramidal 

 panicle and with short-pedunculate clusters of flowers in the axils of the upper leaves ; pedicels 

 stout, 0.5-1 cm. long; involucellate bractlets lance-linear, 3-5 mm. long, about equaling the 

 calyx-tube; calyx 5-8 mm. long, the lobes ovate, 2-4 mm. long, acute, sometimes mucronate; 

 petals rose-pink, 8-12 mm. long; stamineal column 3-6 mm. long; carpels 2-2.5 mm. high, 

 stellate-pubescent on the summits, glabrous on the backs and sides ; seeds ovate-reniform, irreg- 

 ularly stellate-puberulent, the surface finely reticulate. 



Dry washes, Upper Sonoran Zone; San Fernando Valley below 2,000 feet altitude, Los Angeles County, 

 California. Type locality: San Fernando Valley, Los Angeles County, California. July-Nov. 



4. Malvastrum Jonesii Munz. Jones's Malvastrum. Fig. 3180. 



Malvastrum Jonesii Munz, Bull. S. Calif. Acad. 24: 88. 1925. 

 Malvastrum Dudleyi Eastw. Leaflets West. Bot. 1 : 218. 1936. 

 Sphaeralcea fasciculata var. Jonesii Jepson, Fl. Calif. 2: 501. 1936. 



An openly branching shrub with dense stellate-canescent branchlets and herbage. Leaves 

 rhomboidal-ovate to suborbicular, truncate to cuneate at the base, irregularly crenate above the 

 base, scarcely lobed, 1.5-5 cm. long, prominently veined beneath; petioles 1-2.5 cm. long; 

 stipules lance-subulate, 4-6 mm. long; inflorescence racemose-paniculate, 10-30 cm. long; invo- 

 lucellate bractlets linear-setaceous, 3-4 mm. long; pedicels stout, 2-7 mm. long; calyx broadly 

 campanulate, densely canescent-tomentose, 6-8.5 mm. long, the lobes ovate, acute, 3-3.5 mm. 

 wide, 4-5 mm. long; petals 10-14 mm. long, oblong, rose-colored; stamineal column about two- 

 thirds as long as the petals; carpels reniform-ovoid, 2.5-3 mm. high, pubescent over the summit 

 when young, glabrate except on the angles and about base of style in age; seeds black or dark 

 brown, 2-2.5 mm. high, minutely puberulent in irregular patches. 



Hillsides and in chaparral. Upper Sonoran Zone; Santa Lucia Mountains in southern Monterey County to 

 the vicinity of Paso Robles, San Luis Obispo County, California. Type locality: Paso Robles, California. 

 April-July. 



5. Malvastrum fasciculatum (Nutt.) Greene. Mesa Malvastrum. Fig. 3181. 



Malva fasciculata Nutt. ex Torr. & Gray, Fl. N. Amer. 1: 225. 1838. 

 Malvastrum Thurberi A. Gray, Mem. Amer. Acad. II. 5: 307. 1854. 

 Malveopsis fasciculata Kuntze, Rev. Gen. PI. 1: 72. 1891. 

 Malvastrum fasciculatum Greene, Fl. Fran. 108. 1891. 

 Malacothamnus fasciculatus Greene, Leaflets Bot. Obs. 1 : 208. 1906. 

 Sphaeralcea fasciculata Arthur, Torreya 21: 11. 1921. 



Openly branched shrub, 1-3 m. high with flexuous, sparingly leaved branches, finely stellate- 

 pubescent on young herbage, bark becoming smooth and gray in age. Leaves broadly pentagonal, 

 shallowly 3-5-lobed, crenate, 1-6 cm. long and broad, truncate to subcordate at base, green 

 above, stellate-canescent beneath; petioles slender, 0.5-2 cm. long; stipules setaceous, 2-4 mm. 

 long; inflorescence interrupted-spicate, often virgate, the flowers in ebracteate clusters and in 

 the axils of the upper leaves ; involucellate bractlets setaceous, shorter than the calyx-tube ; 

 calyx 6-8 mm. long, finely scurfy-stellate, the lobes ovate, acute, 3-4 mm. long; petals 12-20 

 mm. long, deep rose; carpels ovate, 2.5-3 mm. high, appressed stellate-puberulent on the summit 

 and one-fourth the way down the back, glabrate in age ; seeds dark brown, irregularly and finely 

 stellate-puberulent. 



Foothills and lower mountains. Upper Sonoran Zone; west of the divide from Tehachapi Mountains, Cali- 

 fornia, south into northern Lower California. Type locality: probably near San Diego, California. Jan.-July. 



Malvastrum fasciculatum var. laxiflorum (A. Gray) Munz & Jtn. Bull. Torrey Club 51: 296. 1924. 

 (Malvastrum Thurberi var. laxiflorum A. Gray, Proc. Amer. Acad. 22: 291. 1887; Sphaeralcea fasciculata var. 

 laxiflora Jepson, Man. Fl. PI. Calif. 634. 1925; Malvastrum Parishii Eastw. Leaflets West. Bot. 1: 216. 1936.) 

 Inflorescence lax, paniculately branching, pedicels and peduncles 1-5 cm._ long, otherwise as in the species. 

 Canyon sides and in chaparral from Ventura and western San Bernardino Counties south through Orange 

 County, California, into northern Lower California. Type locality unknown. 



