COXTRIBUTION-S TO WESTEKN BOTANY NO. 15 141 



od5 falcate;, ;'.2';x:ni. long, -diielincd to' :t>e^'litileNivaaer'al»ve, about 5 ihtti 



tiim 



marsiins cross-ribbed 



Todos 



* r 



CaesaTpinia-Biajv. iiixa N. Sp. Slender shrub with gray laark/ \Vith 

 short braachesu' Leaves 1-2 dm. long and wide, dark-green 'above and 

 spni&wiiat.. lighter below, smooth^ except when young-, aiid then with vtry 

 .short hdirs and minute glands oh petioles and rachis and pedicels. ' FlanV. 

 i^-nann;d. .Leaves even-pinnate, with 2 pair's of pinnae which have aboat 



cm 



Taceme^viii the axils of the leaves; on pedicels^-1-2 cm. long/ ascendang. 

 iPods about 6. cm; dong by 3-4-. cm. wide, very' flat^and chartacecKis, 'with 

 strong borders^ rounded at -tip and very shortly-ciineate at base, on a 

 vstout-. stipe about 5 mm.^ long,.^ chestnut-colored, smooth and shining, split- 

 ting tardily along the sutures, ' with 2 seeds, flattened and about 1 cnj. 



wide. 



January 



platyloba Watson; ;No.' 2 298 ?v ^an 



» 1 



» • Acacia Mazatlana N. Sp.: Slender s^hrub, several feet 'high, ercd anc! 

 widely branched, spineless, copiously leafy with smooth leaves/about 2 din. 

 long, evenly bipinnate\,with 2-S pairs of pirinae; and thepWac with 3 

 pairs of diamond-shaped leaflets which are shining above- and lighter col- 

 .cred below and veiny, ^3-4. cm. long by 1.75 cm. wicie, shortly •acuminate 

 to acute at both ends, with a few scattered hairs in the ■ veins 'and ba^se. 



It, about 4 cm. long, glandless or with minute -and; ^sca'l; 

 tered papillate as if glands; ^Stipules minute. Inflorescence a raceme -of 

 ipnbels, the lowest umbels subtended bj small leaves. Peduncles of thfc 

 umbels about 2 cm. long, horizontal. Umbels ^about 6-fruited, the stamfn?. 

 reddish and innumerable and free. Flowers not seen- Pods' very ■ ftat._ 4 



stout 



tout 



cm. long by 1 cm. wide, oblong, with often wavy outline, "flattened between 



" ' <y, apiculate at tip, and cuneate at very base,tapcnn,? into 

 cm. long. .Valves splitting off flat through a part of tljc 

 stipe. Seeds about 6. 3 mm. long, nearly round, mottled, bm\vn. This Tia. 

 pods much like those of A. filicina, but leaflets entirely di^^imilar. ■^(>. 

 224.^0. Mazatkn, Sinaloa, November 20, '1 926, on hills. Thrs seems .c 

 brlon-^ to the class of A. Rosei Standley but apparently quite distmct. 



Section Platycarpos. Perennial, about a 

 foot high, erect, "smooth except' for a few scattered hairs on the stems and 

 leave.. Petioles filiform, 2-3 cm. long, a Httle larger than the leaflets: 

 Stipules small and subulate and mostly attached to base of petiole. Leaf- 

 lets about 5. oblanceolate. about 2 cm. long, apiculate at the rounded 



acunensis 



below 



long. Bracts small 



nun. wide: thin. Peduncles terminal, 2-4 inches^ 



filiform, about 5 mm 



lane, ascending.. Flowers about round, nearly i en 

 blui.^h borders. Calyx deeply lobed, the upper lobe 

 middle and with triangular lobes as long as tube, 



■. ,*,*- 



