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96 



CONTEIBDTIONS FROM THE NATIONAL HERBAEIUJI. 



TWO NEW SPECIES OF ALCHEMILLA. 



In preparing a synop^sis of the ^Mexican species of Alclicmilla I find the 

 two following species undescribcd. The genus Ah'heniilhi is a very diffi- 

 cult one, owing to the fact that tlie flowers are all extremely small and 

 not easy to make out clearly with an ordinary hand lens, whence col- 

 lectors and botanists have not looked into the lloral characters carefully. 

 As a result several ^Mexican species are passing under the same nanie. 



Alchemilla procuin"bens Rose, sp. nov. 



Platk XXVII. 



rerennial with numerou;^ creeping stomf^^ those clothed with apprepped pubesceiu-e; 

 leaves 3-parted, appearui<,^ r>-parted from the lateral lobes being deeply cleft, dark 

 greeii and glal>rous above, paler and upprey^ed-pubet^cent beneath, the lobes spatu- 

 late, ronnded at apex, Kerrate-toothed; sti[)ules united at base, toothed; inflorescence 



rather open, feAv-flowered; pedieelri slender," 4 to 8 mm. lon<r, silky-pubc^^ceut; calyx 

 pabeHC(^nt, 8-parted, the 4 outer lobes mtieli broader and longer than the otliers, 

 pubescent -within; stamens 2; styles sometimes as many as 8. 



Type U, S. National Herbarium no. 452C)85, collected by J. N. Ros(^ and Jos. H. 

 Painter between Somoriel and Las Lajas, Hidalgo, August 5, 1905 (no. 9202), 



Apparently common in the high nitjuntains of Mexico from Zacatecas to Oaxaca. 



Explanation of Plaie XXVIL— Fi^^ <i, plant; h, calyx; c, section of calyx .Khuwiiit,^ stamens and 

 styles. Fig. a, natural size; figs, h and c, enlarged. 



Alchemilla sulDalpestris "Rose, sj). nov. 



Perennial but with herbaceous stems, either single and erect or much branched at 

 base and ascending; stems 10 to 30 cm. long, often glabrous throughout or with scat- 

 tered flairs on the stem, leaves, and bracts and very rarely on tlie calyx; basal and 

 lower stem leaves on petioles sometimes fi to 9 cm. long, somcwliat orbicular in out- 

 line, more or less lobod and cleft; upp(^r stem leaves ptTfoliate, the lobes '^ or 4-cleft 

 hito linear obtuse teeth, the margins revolnte; flowers subsessile; calyx usually 

 glabrous, 8-lobed, the lobes nearly equal; stamens 2; styles 2; fruiting calyx 1 mm. 

 long; seeds ovoid in outline, pointed. 



Type U. S. National Herbarium no. 451540 (Ruse no, 7928 from Nevada deTuluca). 



Apparently common in the high mountains throughout Mexico. I have frequently 

 collected it, first in the Sierra ^Nladre of Tepic, afterwards on Mount Orizaba and 

 Mount Toluea, and several times on the hi^di mountains surrounding the valley of 



Mexico. 



This species is probably .4. hirsuta a?j)^.s^/ns Schlecht. A: Cham.; at lea^t it is the 

 plant so understood by Dr. 8. Watson and :\rr. Tlemsley. T5ut 1 have not seen the 

 type and with only the short original diagnosis I. can imt be sure of this, wbih* in any 

 case the name alpedr!i> is a homonym and must be rejected. 



MIMOSACEAE. 



A NEW PITHECOLOBIUM. 



Pithecolobium revolutum Rose, sp. nov. 



Plate XXVIII. 



A low depressed compact bush; first year branches very pubescent, older branches 

 gray and glal>rous; stipular spines short, stout, straight or t)ecoming recurved; pin- 

 nae one pair; common petiole short, bearing a gland at tlie top; leaflets [J to 5 pairs, 

 closely set, linear, obtuse, the margins strongly involute, covered with short stiff 

 hairs as are also the rachis and petioles; flowers not seen; pods curved, flattened, 5 

 to 7 cm. long, 10 to 12 nun. broad, pubescent; seeds black. 



Type U. S. National Herbarium no. 45327J, collected by Rose and I'ainter south of 

 Iligm-rillaH, Querctaro, August 23, 1905 (no. 9784). Here a common <lesert sl^rub. 



Kxri-ANATioN OF Pj.atk XX VI II.— Fig. a, biaiidi; Z>, luaf; r,cruss .scuLioii of leaflet; ^f, fruit. Figs. 

 a and t/, iiatunil size; b and c, scaU; G. 



