402 PROCEEDINGS OF THE AMERICAN ACADEMY. 



— Mexico : shaded cliffs of mountains, near Monterey, Nuevo Leon, 

 25 April, 1906, C. G. Pringle, no. 13,877 (type, in Gray Herb.). An 

 attractive little matted plant with the habit of H. serpyllifoUa Michx. 

 and H. serpyllacea (Schlecht.) C. L. Sm. but differing from the former 

 in its more shortly petioled, more acute leaves, and much smaller 

 flowers, and from the latter in its membranaceous strigillose but 

 unciliated leaves, more filiform stems, etc. The absence of fruit and 

 seeds naturally throws a slight doubt upon the generic position, but 

 the general habit, as well as such technical traits as are manifest, are 

 those of Houstonia. 



Neurocalyx calycinus (R. Br.), n. comb. Argostemma calycinwm 

 R. Br. in Bennett, PI. Jav. Rar. 97 (1838). Neurocalyx Wightii Am. 

 Ann. Nat. Hist. iii. 22 (1839). N. Hooker iana Wight, Ic. i. t. 52 

 (1840). 



Rondeletia leptodictya, n. sp., fruticosa 2 m. alta ; ramis gra- 

 cilibus rubro-brunneis flexuosis teretibus mox glabratis ; foliis oppositis 

 obovato-oblongis acuminatis basi modice angustatis tenuibus supra 

 viridibus tenuiter (sub lente) reticulatis glabris vel subglabris subtus 

 juventate griseo-tomentosis 6-11 cm. longis 2.5-5 cm. latis; petiolis 

 gracilibus 5-12 mm. longis pubescentibus ; stipulis ovato-lanceolatis 

 acutis brunneis 4 mm. longis erectis ; pedunculis terminalibus 4-5.5 cm. 

 longis gracilibus arachnoideis ; floribus sessilibus dense capitatis ; 

 calycis tubo albo-lanato subgloboso 1.8 mm. diametro, lobis limbi 

 4 vix inaequalibus oblanceolatis viridibus vix 2 mm. longis ; corolla 

 sanguinea, tubo gracili sursum vix ampliato 1.4 cm. longo griseo- 

 arachnoideo, lobis limbi 4 patentibus 2-3 mm. longis, ore nudo ; stylo 

 exserto. — Mexico : banks of the Rio Petatlan near the boundary 

 between Michoacan and Guerrero, alt. 500 m., 24 November, 1898, 

 E. Langlasse, no. 666 (type, in Gray Herb.). Near R. elongata Bartl., 

 but with calyx-lobes much shorter (scarcely a fifth the length of the 

 corolla-tube), the limb of the corolla smaller, and the stipules much 

 shorter than the petioles. 



Rondeletia rufescens, n. sp., fruticosa; ramis teretibus tarde 

 glabratis cortice griseo tectis, ramulis et pedunculis et petiolis dense 

 rufo-tomentosis ; foliis lanceolato-oblongis 9-15 cm. longis 3.2-5 cm. 

 latis apice basique acuminatis tenuibus supra obscure reticulatis et 

 molliter puberulis subtus albido-tomentosis, nerviis lateralibus ca. 

 10-jugis ; inflorescentiis terminalibus thyrsoideis flexuosis ca. 1.5 dm. 

 longis rufo-tomentosis ; cymulis superioribus subsessilibus inferioribus 

 2-12 mm. longe pedicellatis bracteis lineari-subulatis ca. 3 mm. longis 

 suffultis multifloris ; floribus brevissime pedicellatis aut sessilibus ; 

 calycis tubo subgloboso minute hirsuto, lobis 4 linearibus inaequalibus 



