852 MINNESOTA BOTANICAL STUDIES. 



length of the leaves; stipules small, subulate; flowers axil- 

 lary, near the ends of the branches, large, white, or tinged 

 with pink, on pubescent pedicels, which are jointed near the 

 end; involucral bracts seven in number, linear-lanceolate, a 

 half inch in length; calyx broadly tubular, somewhat inflated 

 above, an inch and a half in length, short pubescent on the 

 outside, wooly within, the teeth ovate-lanceolate, a half inch in 

 length; petals five to six inches in length, including an ex- 

 serted claw of two inches, one and a half to two inches wide, 

 prominently veined, pubescent on the outside; staminal column 

 rather stout, long exserted, red; stamens numerous, filaments 

 slender, an inch in length, anthers red; styles five, slender, 

 ascending, the stigmas capitate, red. 



A well marked species, united by Hillebrand with the Oahu 

 plant which he calls Hibiscus arnottianus. Although closely 

 related to that plant, it differs in numerous particulars. It is a 

 much larger tree, with smaller leaves, of a different shape and 

 texture. The pubescence is somewhat stellate, as indeed it 

 seems to be in all of the Hawaiian plants. The type is No. 

 2785, collected at the base of the plateau above Waimea, Kauai, 

 at an elevation of 3000 feet. 



Hibiscus youngianus Gaud.; H. & A. Bot. Beechy. 79. 1832. 



This species is mentioned by Gaudichaud, in Bot. Voy. 

 Uranie, but is not described. The first description appears to 

 be by Hooker & Arnott, who credit the species to Gaudichaud- 

 Its natural habitat is in the marshes at no great distance from 

 the coast, and is described by Hillebrand as "an erect, spar- 

 ingly branched undershrub, 2-3 feet high." Specimens were 

 collected in upper Pauoa valley, Oahu, growing in a little 

 ravine, where it attained a height of ten feet, bearing a few 

 branches near the top. It was also seen as a bush five or six 

 feet high, in marshes near Pearl City. It is found only on 

 Oahu. 



April to June (2007). 



MALYASTRUM A. Gray. Mem. Am. Acad. (II) 4:21. 



1848. 



Malvastrum americanum (L.) Torr. Bot. Mex. Bound. Surv. 

 38. 1859. 

 Malva americana L. Sp. PL 687. 1753. 

 Malvastrum tricuspidatum A. Gray, PI. Wright. 1 : 16. 1852. 

 This is one of the most common weeds about dwellings and 

 in cultivated ground. It was seen on both Oahu and Kauai. 

 April to August (2136); original locality, "in America." 



