ROBINSON. — DIAGNOSES ETC. OF SPERMATOPHYTES. 503 



bus, cortice griseo pustulis suberosis fulvis maculate; aculeis infrasti- 

 pularibus gerainis rigidis patenti-ascendentibus arcuatis cavis 4-6 cm. 

 longis basi 5 ram. diametro apicem attenuatam versum cum foramine 

 verisimiliter a formicis facto munitis; foliis ca. 2 dm. longis ca. 8 cm. 

 latis; petiolo 1 cm. longo subtereti supra canaliculato; pinnae 14-16- 

 jugis lineari-oblongis contiguis vel etiam imbricatis falcatis basi 

 obliquis apice rotundatis ca. 6 mm. longis 1 mm. latis glabris subtus 

 pallidioribus; inflorescentiis globosis usque ad 15 ex eodem axillo; 

 pedunculis brevibus 1-2.5 cm. solum longis ca. 2-4 mm. supra basin 

 cum involucro annulari squamuliformi saepius 3-partito instructis 

 nee non media in parte cum involucello simili munitis; calyce sub- 

 cylindrico parum superne ampliato breviter 4-dentato; corolla breviter 

 exserta glabra; legumine sessili falcato-lineari ca. 14 cm. longo 6 mm. 

 solum lato margine valde incrassato faciebus concavis glabris apice 

 basique attenuate. — British Honduras, Prof. Morton E. Peck, no. 632 

 (type, in Gray Herb.). x\notlier species of the highly interesting 

 ant-inhabited Acacias like .4. sphaerocephala Cham. & Schlecht., .4. 

 spadicigcra Cham. & Schlecht., .4. Hindsii Benth., etc., but diflFering 

 from all these markedly in the double involucre of the peduncles, as 

 well as in the long narrow pod, and various other features. 



Sesbania vesicaria (Jacq.) Ell., var. atro-rubra (Nash) S. C. 

 Brooks, comb. nov. Glottidium floridanum (Willd.) DC, var. atro- 

 ruhrum Nash, Bull. Torr. Bot. Club, xxiii. 101 (1896). G. vesicarium 

 airoruhrum (Nash) Small, Fl. S. E. U. S. 615 (1903). 



Aeschynomens tenerrima, spec, nov., herbacea gracilis palustris 

 ca. 5 dm. alta ubique glaberrima; caule tereti pallide brunneo deor- 

 sum leviter spongiose incrassato supra gracillimo paucirameo, ramis 

 ascendentibus subfiliformibus; foliis 2-3.5 cm. longis brevissime 

 petiolatis; rhachi filiformi; foliolis ca. 18-jugis minutis oblongis basi 

 obliquis apice rotundatis 2-2.3 mm. longis 1 mm. latis utrinque pallide 

 viridibus concoloribus; racemis axillariljus 2-3-floris gracillimis; 

 bracteis lanceolatis subscarioso-brunneis vel -purpureis vix 1 mm. 

 longis; floribus anthesi ca. 2.8 mm. longis; calyce herbaceo pallide 

 viridi plus minus ve bilabiate, fructifero persistenti brunnescenti; 

 petalis violascentibus ca. 2-2.5 mm. longis; legumine longe (ca. 5 mm.) 

 graciliterque stipitato valde ex calice exserto, articulo unico semiorbi- 

 culari 4 mm. longo glabro margine incrassato apice cum styli basi 

 torta vel curvata appendiculato faciebus leviter reticulate- venosis. — 

 Swamp near Ycace Lagoon, British Honduras, 15 May, 1907, Prof. 

 Morion E. Peck, no. 900 (type, in Gray Herb.). A very delicate 

 palustrine species with exceedingly small leaflets and incenspicuous 



