NTBIBDTION8 FROM THE RATIONAL ll KKi; \ i;i r M. 

 TWO NEW SPECIES OF ALCHEMILLA. 



In preparing a By nopsis of the Mexican species of Alchemilla I find the 

 two following sp 'cies undescribed. The genua Alchemilla [3 a \ »t\ »liili- 

 cull one, cw ing to the fact that the flowers are all extremely -mall ami 

 not easy t<> make out clearly with an ordinary hand lens, whence col- 

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

 A- a result several Mexican species arc passing under the same name. 



Alchemilla procumbens Rose, Bp. DOV. Plate XXVII. 



Perennial with numerous creeping stems, these clothed with appressed pubescence; 

 leaves 3-parted, appearing 5-parted from the lateral lobes being deeply cleft, dark 

 green and glabrous above, paler and appressed-pubescenl beneath, the lobes spatu- 

 late, rounded at apex, Berrate- toothed; >t i j .uUs united at base, toothed; inflorescence 

 rather open, few-flowered; pedicels slender, 4 to s mm. long, silky-pubescent; calyx 

 pubescent, 8-parted, the 4 enter Lobes much broader and longer than the others, 

 pubescent within: stamen- l': styles BOmetimes as many as - 



Type U. S. National Herbarium no. 452685, collected by J. N. Rose and .1"-. II. 

 Painter between Somoriel ami Las Lajas, Hidalgo, August 5, 1905 (no. 92i 



Apparently common in the high mountains of Mexico from Zacatecas t" < >a\aca. 



Explanation of Plate XXVU. — Fig. ". plant; '-. calyx; c, section of calyx showing stami 

 styles. Fit:. ". natural size; Bgs. band <■. enlarg 



Alchemilla subalpestris Rose, sp. nov. 



Perennial but with herbaceous Btems, either single ami erect or much branched at 

 base an<l ascending; stems in to 30 cm. long, often glabrous throughout or with scat- 

 tered hairs on the stem. Leaves, and bracts and very rarely on the calyx; basal and 

 lower stem leaves on petioles sometimes n' to '.» cm. long, somewhat orbicular in out- 

 line, more or less lobed and eleft; upper stem leaves perfoliate, the lobes 3 or t-cleft 

 into linear obtuse teeth, the margins revolute; flowers subsessile; calyx usually 

 glabrous, 8-lobed, the lol.es nearly equal; stamens 2; styles l': fruiting calyx 1 mm. 

 long; seed- ovoid in outline, pointed. 



Type IT. S. National Herbarium no. 451546 \l>»r no. T'.'i's from Nevada deToluca I. 



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

 collected it. first in the Sierra Mad re of Tepic, afterwards on Mount Orizaba and 

 Mount Toluca, and several times on the high mountains surrounding the valley of 

 Mexico. 



This species is probably A. hirsute alpestris Schlecht. &Cham.; at least it is the 

 plant -o understood by Dr. S. Watson ami Mr. Hemsley. But I have not seen the 

 type and with only the short original diagnosis I can not he sure of this, while in any 

 case the name alpestris is a homonym and must he 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 glabrous; stipular spines short, stout. Btraightor becoming recurved; pin- 

 nae one pair; common petiole short, bearing a gland at the top; leaflets :*> to :» pairs, 

 closely set. linear, obtuse, the mar-ins strongly involute, covered with short stiff 

 hairs as an- also the rachis and petioles: Mowers not -ecu: pods curved, flattened, 5 

 to 7 cm. long, 10 to 12 mm. broad, pubescent; Beeds Mack. 



Type r. B. National Herbarium no. 453274, collected by Rose and Painter south of 

 Higuerillas, Queretaro, August 23, 1905 no. 9784 . Here a common desert shrub. 



Explanation "i P] ltj XXVIII. -Fig. a, branch; b, leaf ; c, cross section of leaflet; '/.fruit 

 a and '/. natural size; b and <•. scale »;. 



