(418 ) 
soft, short-rayed, stellate pubescence; inflorescence loose, com- 
pound; bractlets subulate, 2-3 mm. long; calyx 1cm. long; lobes 
triangular, acute, equaling the tube; petals rose-purple, twice the 
length of the calyx; carpels stellate-pubescent on the summit, 
obovate, 3 mm. high. 
This species was first discovered by Nuttall who considered it 
an undescribed species of Malva, but the name proposed by him 
over seventy years ago has never been published and now is not 
tenable. I therefore take pleasure in naming this long unrecognized 
but strikingly distinct species in honor of that acute observer and 
enthusiastic collector. 
Type: Casitas Pass, Ventura County, Abrams, July 25, 1908. 
The type specimen is deposited in the Herbarium of Stanford 
University. 
Distribution: Southern slopes of the Santa Ynez Mountains. 
Upper Sonoran. 
Specimens examined: Foothills of the Santa Ynez Mountains, 
near Santa Barbara, Elmer 3730; Franceschi, Nov. 1909; Greene, 
July, 1886; Casitas Pass, Abrams, July 25, 1908. 
3. MatacotHamnus Davinson! (Robinson) Greene, 
Leaflets 1: 208. 1906. 
Malvastrum Davidsoni Robinson, in A»Gray, Syn. Fl. 1, pt. 1: 312. 
1897. 
Type locality: The type specimens were collected by Dr. A. 
Davidson in ‘San Fernando Valley.” 
Distribution: Robinson reports this species from Antelope and 
Bear Valleys as well as from the San Fernando Valley. ‘The Bear 
Valley specimens cited by him I have not seen, but those from 
Antelope Valley (Parish 1955) belong to the next species. ‘This 
species is known to me only from San Fernando Valley and the 
adjoining La Canada. Lower Sonoran. 
Specimens examined: San Fernando, Davidson, May, 1893, and 
June 24, 1895; San Fernando wash, Davidson, 1907; Big Tejunga 
wash, Lyon, Aug. 1884; La Canada, Abrams r4or. 
4. Ma.LacotTHamus orBicuLatus Greene, Leaflets 1: 208. 
1906. 
Malvastrum orbiculatum Greene, Fl. Fran. 109. 1891. 
Type locality: “In the mountains south of Tehachapi, Kern 
Or evig 
