256 Engelmann and Gray, 



bilabiati labio supcriore erecto subgaleato breviter bilobo vel 

 integro, inferiore profunde trifido, lobis rotundatis patentibus 

 seu recurvis. Stamina 4, sub labio superiore adscendentia : 

 filamenta supra medium corollae adnata, ubi pilosa, inferioribus 

 eminentibus : antherae approximata? ; loculis distinctis divari- 

 cantibus ad rimam pi. m. ciliatis. Stylus glaber apice eequali- 

 ter bifidus, lobis subulatis. Achenia sicca. — Herbse annua?, 

 Texance, facie foliis et inflorescentia Physostegiae. Corolla 

 incarnata, fauce luteola. 



<§> 1. Eubrazoria. Calycis lobi latissimi, truncati, subsequa- 

 les, mucronato-denticulati : corolla majuscula tubo prope basin 

 piloso-annulato ; fauce infra labium inferiorem intrusa quodam- 

 modo palatum efficiente ; lobis omnibus eroso-crenulatis, iisdem 

 labii inferioris sequalibus, apice bilobis : achenia triangulata, 

 pubera. 



286. Brazoria truncata = Physostegia truncata, Benth. 

 Lab. p. 505 ; Hook. Bot. Mag. t. 3494. — Sandy soil on de- 

 serted ant-hills, &c, in the prairies along the Brazos : May — 

 June. It was first collected by Drummond (No. 274 of the 

 Third Collection) ; and has since been gathered on the Colo- 

 rado by Dr. Wright. Stem pubescent, scarcely a foot high. 

 Spike dense. Calyx hairy at the base, especially after flower- 

 ing. Flowers nearly as large as in Physostegia Virginiana : 

 the tube of the corolla spotted with purple. The lobes of the 

 lower lip of the calyx are usually merely mucronulate in the 

 middle ; those of the upper are erose-denticulate with mucro- 

 nulate teeth. In fruit the achenia are contained in a gibbous 

 cavity belonging to the upper side of the calyx : this is closed 

 by the inflexion of the lower lip, which is appressed to the 

 face of the upper, or partly wrapped around it ; so that the 

 fructiferous calyx is flat on the lower side, and very gibbous at 

 the base of the upper side. 



§> 2. Stachyastrum. Calycis sub-7-nervis labium superius 

 latum, lobis rotundatis ; inferius angustum, lobis triangu- 

 lari-lanceolatis, omnibus cuspidato-mucronatis : corolla exan- 

 nulata, parvula ; lobo medio labii inferioris ceeteris majore, 



