PENTSTEMON. SCKOPHULARIINAE. 251 



55. P. DOUGLASII Hook. 1. c. — Frulicosum humile: ramis subfasligialis ereclis ; 

 foll. glaberrimis obovato-lanceolatis acutis coriaceis integerrimis sessilib.; race- 

 mis terminalib. ; pedicellis oppositis; capsulis nigrescentib. calycem paullulum 

 excedentibus. 6 — Affine praecedenti, sed dislinctissimum. Folia '/2 -74 poll. 

 longa, exsiccata nigricantia. Segmenta calycina. ovato-lanceolata serrulata, quam 

 capsulae pallidiora. — Crescit in America boreali-occidentali (Blue mountains). 



56. P. GAIRDNERI Hook. I. c. 99. — Fruticosum humile minute puberulum: ramis 

 subfastigialis ereclis strictis; foll. alternis lineari-spathulalis (supremis linearib.) 

 coriaceis integerrimis sessilib.; racemis elongalis; pedicellis alternis (!!!!) brac- 

 lealis; capsulis rubro-fuscis calyce concolori paullulum longioribus. 6 — Crescit 

 in America boreali-occidentali (Blue mountains). 



57. P. SERRULATUM Menzies mss. ex Hook. 1. c. 95. — Caule glabro; foll. omnib. 

 argute serratis, superiorib. ovatis subhastatis; panicula bi-trifurcata; filamento 

 sterili barbato. 2j. — Forte idem ac P. diffusum. — Crescit iu America boreali- 

 occidentali. 



tt Species dubiae. 



58. P. ARGUTUM Paxton, Magazine of botany VI. 271. c. icon. ex D. Dietr. Synops. 

 planlar. IIL 505. no. 49. — Suffruticosum pubescens: caulib. numerosis ramosis- 

 simis; foll. opposilis partim connatis, superiorib. ovatis, infeiiorib. spathulalis 

 irregulariter serralis, subtus pallidiorib.; calycis dentib. quinque aequalib. ovato- 

 lanceolatis persislentib.; stylo apice recurvo, superne barbato. 6 — Planta 3-4- 

 pedalis. Corolla bilabiata violaceo-purpurea. Filamenta alba. — In Mexico. 



59. P. ALPINUM Torr. mss. ex Spr. Syst. vegetab. IV. 235. — Glaberrimum: foll. 

 oblongo-lanceolatis denticulatis; pedunculis multifloris; corolla subregulari; an- 

 theris hirsutis, 2|. — Chelone alpina Spr. 1. c. — Crescit in Araerica boreali ad 

 Rocky mountains. 



39OO/1. TETRAXEMA Bth. 

 (Blh. in Lindl. Bot. Regist. [New Ser.] XVL t. 52 — Endl. Gen. pl. Suppl. IV. ined.) 

 1. T. (PENTSTEMON Hortul.) MEXICANUM Bth. I. c. — Herba humilis habilu 

 Gloxiniarum. Caulis simplex brevissimus. Folia opposita vix petiolala, petiolis 

 vaginatim subamplcxicaulibus, ovata, basi longe allenuata, acuta serrala, nervo 

 medio valde prominenle, supra glauca, infra rubentia, utrinque — ut videtur — 

 glaberrima, crassiuscula. Pedunculi axillares bini longiusculi, folio breviores, 

 apice foliolis 2 lanceolatis instructi, ||)res plurimos (12-20) brevissime pedicella- 

 tos gerentes. CoroIIae tubus rubicundus, calyce triplo longior, limbo bilabiato, 

 labio superiori apice bifido, labio inferiori trifido, laciniis ovalibus obtusis albes- 

 centibus, purpureo-striatis. C^. — A genere Penlstemon differt solummodo stamine 

 quinto sterili deficiente, — Crescit in Mexico. 



3910. RUISISELIA Jcq. 



(Jcq. Plant, Americ, 176, tab, 113, — Meisn, Gener, plant, vascul, I, 308. II. 219. — 



Spr. Syst. veget. II. 811. — G. Don, General syst. of gard. and bot. IV. 513. sq.) 



§. 1. FoUis oppositis; cauUbus ramisque quadrangularibus. 



1. R. SARMENTOSA Jcq. Plant. Americ. 178. t. 113, — Willd, Spec. plant. III. 344. 

 — Kth. Synops. plant. aequinoct. II. 119. — G. Don I. c. 514. no. 1. — Caule ra- 

 misq. quadrangularib. glabris; foll. oppositis ovatis, basi rotundatis, supra pilo- 

 siusculis; corymbis axillarib. pedunculatis 3-5-floris. 6^ — Folia breviter pe- 

 tiolata ovata acula dentata, supra pilosiuscula, infra glabra, 8 lin. longa, 5 lin. 

 lala. Corolla carnea v. pulchre rubicunda semipollicaris. — Crescit in sylvaticis 

 insulae Cubae prope Guanavacoa, 



2. R. MULTIFLORA Sims, Botanic. Magaz. t. 1528. - G. Don I. c. no. 2. — Caule 

 quadrangulari glabro subscandente ; foll, opposilis peliolatis ovalo-oblongis 



3-2* 



