Laphamia. COMPOSITE. 319 



134. LAPHAMIA, Gray. (Dr. Increase Allen Lapham, of Wisconsin, 

 died in 1875.) Low suffruticulose perennials, Texano-Arizonian, growing in 

 crevices of rocks, mostly with petioled and dentate or laciniate small leaves, the 

 upper alternate, rarely all opposite ; small heads of yellow (rarely white ?) flow- 

 ers, either cymosely disposed or singly terminating the branches : fl. spring and 

 summer. --PL Wright, i. 99, t. 9 ; Benth. & Hook. Gen. ii. 398, excl. spec. 



L. PENINSULARIS, Greene, Bull. Calif. Acad. i. 8, is an extra-limital species (with rather 

 large and radiate heads and 110 pappus) from Lower California. 



1. PAPPOTHKIX, Gray, 1. c. Pappus of about 20 unequal rigid hispidulous 

 bristles, hardly as long as the somewhat quadrangular-compressed akene, shorter 

 than the corolla : rays none: disk-flowers 12 to 15 ; the corolla with short proper 

 tube and cylindraceous throat : bracts of the involucre 5 to 8, linear-oblong, nearly 

 plane : stems slender, a span or more high and much branched from the stout 

 woody base : leaves mostly opposite, as broad as long, abruptly slender-petioled : 

 short-peduncled heads rather scattered. 



L. rupestris, GRAY, 1. c. Pubescent, slightly viscid, leafy to summit : leaves (half-inch 

 long) sometimes crenately sometimes strongly and acutely dentate or almost laciuiate : 

 pappus much exceeding short proper tube of the corolla. S. W. Texas, Wriyld, Biyelow. 



L. cinerea, GRAY. Tomentose-canescent : leaves more orbicular, almost entire: pappus 

 hardly surpassing the proper tube of the corolla, which is more than half the length of the 

 short-cylindraceous throat: akeues sometimes 4-uerved. Bot. Mex. Bound. 82. Kocks 

 along Escondido Creek, S. W. Texas, Biyelow. 



2. LAPIIA"MIA proper, Gray, 1. c. Pappus of a solitary very slender bristle 

 (very rarely a pair from the same angle), or none : akenes flatter : disk-flowers 

 15 to 20; their corollas with longer and glandular tube. Monothrix, Torr. in 

 Stansb. Exped. 389, t. 7. 



* Involucre 15-20-flowered, of nearly as many plane and linear pubescent bracts : leaves nearly 

 orbicular in outline, palmately lobed or dissected, not punctate, the lower opposite. 



L. LGinmoni, GRAY. Depressed and diffuse, much branched, hardly a span high, villosely 

 pubescent, leafy throughout : leaves a quarter or third of an inch iu diameter and with 

 petiole of equal length, obtusely 3-lobed and the lobes coarsely crenate-deutate : heads (3 or 

 4 lines long) short-peduucled : rays none : akenes cauescently puberuleut : pappus a very 

 delicate bristle, or occasionally a pair from the same angle, little surpassing the proper tube 

 of the corolla, or often none. Proc. Am. Acad. xvi. 191. Southern Arizona, near Camp 

 Lowell, Lennnon. 



Var. pedata, GRAY, 1. c. Leaves pedately parted and cut into narrow lobes. With 

 the other form, also on the Chiricahua Mountains, Lemmon. 



* * Involucre 15-25-flowered, rather narrow, glabrous, of thinnish nearly plane bracts, 2 or 3 

 lines long: herbage merely puberulent: leaves mostly angulate-toothed or incised, the lower 

 opposite : heads commonly corymbosely cymose and pedunculate. 



L. halimifolia, GRAY. Stems a span or more high and crowded on a thick woody caudex : 

 leaves coriaceous, resinous-punctate or atomiferous, somewhat viscid, broadly ovate or rhom- 

 bic, seldom inch long, laciniately dentate, abruptly loug-petioled : rays 4 to 6, with broad and 

 short ligules little longer than the tube: pappus none. PL Wright. I.e. 99, t. 9. S. W. 

 Texas, Wright, Bigelow. 



L. angustifolia, GRAY. Leaves lanceolate or rhombic-lanceolate, tapering into margined 

 petioles, laciuiately 1-5-toothed or lobed : heads less numerous, scattered : rays none : other- 

 wise much like the preceding species. PI. Wright. 1. c. & ii. 81. S. W. Texas, on high 

 and rocky hills of the Pecos, Wright, Havard, the latter's specimens connecting with var. 

 laciniata, Gray, Bot. Mex. Bound. 82, which proves to be only a form with long and weak 

 stems, hanging from rocks on the Rio Grande, Biyelow, Schott. 



