64 PROCEEDINGS OP THE AMERICAN ACADEMY 



Amsonia brevifolia. Glabra ; foliis ovatis vel superiorlbus lan- 

 ceolatis crassiusculis basi aiigustata subsessilibus ; corolla lobis ovatis 

 oblongisve tubo subclavato dhnidio brevioribus, fauce sub ore tantum 

 barbato : stigmate subtrochleari apice bilobato ; foUiculis moniliformi- 

 torosis in articulis turgidis facile secedentibus. — S. Utab and "W. 

 Arizona, to tlie border of California, Mrs. Tbouipson, Dr. Parry, Dr. 

 Palmer. Tbere are four western species, forming a section, charac- 

 terized by having a bilobed tip to the stigma, and the more or less clavate 

 tube to tlie corolla always longer than the lobes ; the calyx deeply 

 parted into attenuate-subulate divisions (2 or 3 lines long) ; the stems 

 lower, more branched, and bearing smaller or simpler flower-clusters 

 than the eastern species. Of these the present and the nearly i-elated 

 A. tomentosa, Torr., have very torose follicles, disposed when dry to 

 break up into joints. A. longijlora, Torr., and the following appear 

 always to produce slender and continuous follicles, and have a tube to 

 the corolla four or five times the length of the lobes. 



Amsoxia Palmeri. Glabra ; foliis angusto-lanceolatis lineari- 

 busque sessilibus ; corollce alboe lobis ovatis (lin. 1^-2 longis) tubo 

 clavato intus longe barbato 3-4-plo brevioribus ; stigmate didymo hir- 

 tello ; fulliculis gracilibus continuis. — Arizona, Dr. Palmer. Described 

 from specimens raised from seed collected by Dr. Palmer. Inter- 

 mediate in appearance between A. tomentosa, which is sometimes gla- 

 brous, and A. longijlura. The stigma consists of two tliick lobes, 

 which are distinct almost down to tlie reflexed ring or collar. The 

 eastern species, reducible to two, have a depressed-cajjitate stigma, 

 truncate and entire at the apex. 



PiiiLiBEETiA ToRREYi. Velutino-pubesccns ; foliis cordato-lan- 

 ceolatis vel sagittatis acuminatis ; pedunculis folia a^quantibus 10—15- 

 floris ; corolliB ut videtur albai (lin. 8-9 diametro) lobis late ovatis 

 obtusis extus puberulis villosissimo-ciliatis pedicello parum brevioribus ; 

 columna filamentorum vix ulla. — Sarcosleinma eleffcins? Torr. Bot. 

 Mex. Bound. 1G2, non Decaisne. — S. W. Texas, Parry, ]>igelow. 

 P. elegans is less pubescent, has smoother corolla variegated with pur- 

 ple witliin, narrower lobes, and a manifest column. P. cynanchoides 

 (Sarcosteinma cynanchoides, Decaisne in DC.) is a variable species, 

 with smaller and more numerous flowers, on longer filiform pedicels, 

 the smoothish corolla barely ciliate. P. linearis is a variable low 

 species, of which Sarcostemma heterophyllum, Engelm., appears to be 

 a form approaching the narrowest-leaved P. cynanclioides ; and var. 

 hirtella (^Sarcostemma, Bot; Calif), a narrow-leaved and pubescent 

 form, the leaves rarely auriculate or cordate at base. P. viminalis 



