94 Ign. ürban, 



Bartoniu pumila Hoolcer Lonä. Journ. of Bot. VI. (1847) 227. 



Bartonia multiflora Kutt. Fl. Gamhel. in Proc. Acad. Philad. IV. (1848) 23. 



Mentzelia pumiln 0. Kuntze Revisio Gen. I. (1891) 251. 



Var. 6. Reverclioiiii Urh. et Gilg (nov. vav.) eaiile usqne ad SO cm (et ultra) 

 alto; petalis 1.7 — 2,2 em lougis, oblonges, basi lougissimc uuguiculatis, apice aeutis; 

 staminibus 90 — 120; Capsula matura cj'lindracea, crassa, manifeste inflata. elongata. 



Mentzelia mtda Gray PI. Wright. (1852) p. 73. 



Mentzelia nuda forma sitbintegrifolia 0. Kuntze et forma suhpinnatifida 0. Kuntze 

 Revisio gen. I. (1891) 251. 



Biennis. Radix fusiformis, saepius tortuosa, simplex vel ad basin parce ramosa, 

 usqne ad 18 cm longa, 1,2 cm crassa, caule saepius mnlto crassior. Caulis solitarius erectns, 

 basi 2 — 9 mm crassus, teres, manifeste vel vix longitudinaliter striatulus, pilis brevibns inae- 

 quilongis veiticillatim glocbidiatis + dense obtectus, aliis subduplo longioribus antrorsum spinu- 

 ligeris parcissime intermixtis, flavescens vel flavido-albescens usque albidus, superne plerumqne 

 flavido-virescens vel brunneo-fiavescens, superne vel jam paullo supra basin ramosus, ramis 

 erecto-patentibus apice 1 — 3-floris, gemmis serialibus nullis. Folia alterna, infima + dense 

 conferta, cetera laxa, lila obovato-lanceolata, lanceolata vel lineaii-lanceolata usque sublinearia, 

 3 — 15 cm longa, 0,5 — 1,5 cm lata, irregulariter vel aequaliter sinuato-dentata vel -erenata vel 

 saepius sinuato-pinnatifida, apice acuta vel obtusiuscula, inferne + longe petioliformi-angustata, 

 basi ima iterum subvaginato-dilatata, intermedia sessilia, basi saepius semiamplesicauli-subeor- 

 data, lanceolata vel lineari- lanceolata, aequaliter vel irregulariter sinuato-dentata vel-crenata 

 vel sinuato-pinnatifida usque pinnata, apice acuta vel obtusiuscula, supra pilis antrorsum spinu- 

 ligeris basi bulbiformi-incrassatis laxe aspersa, subtus pilis brevibus inaequilongis verticillatim 

 glocbidiatis densissime obtecta, aliis antrorsum spinuligeris rarissime intermixtis, scaberrima 

 saepiusque subcanescenfia. Flore s apice caulis ramorumque in cymas subconfertas vel laxas 

 usque laxissimas dispositi, cymis semel vel rarius bis bifurcatis, dein saepius in monocbasia 

 1 — 3-flora abeuntibus, ramis inferioribus plerumque unifloris vel ab initio cincinnose evolutis; 

 propbylla ovata vel ovato-triangularia, lanceolata usque linearia, irregulariter vel laxe sinuato- 

 dentata, apice + longe acuminata, 1 — 3,5 cm longa, 0,7 — 1,3 cm lata; praeter haec ad tubi 

 calycini basin bracteolae 1 — 2 lineares integrae vel raro dentibus pareis obsitae longe acumi- 

 natae, 0,5 — 1,1cm longae, 0,2 — 0,3 cm latae inveniuntur. Calycis tubus subconicus vel 

 subcylindraceus, oblongus vel clavatus, inferne sensim attenuatus 0,6 — l,4em longus, 0,3 — 0,5 cm 

 crassus, pilis brevibus sed inaequilongis verticillatim glocbidiatis densissime obtectus, aliis 

 antrorsum spinuligeris basi bulbiformi-incrassatis parce intermixtis, supra ovarium 2 — 4 mm 

 longe productus, ac cupuliformi-ampliatus; lobi in aestivatione inferne quincuncialiter sibi im- 

 bricati, superne aperti, alabastrum ovato-oblongum, longe acuminatum formantes, lanceolati vel 

 lineari-lanceolati, longissime acuminati, 0,7 — 1 cm longi, supra basin er. 3 mm lati, intus bre- 

 vissime ac tenuiter pilosi, extus pube tubi, sed parciore, in fructu persistentes emarcidi ac 

 irregulariter reflexi. flavescentes vel flavidi. Petala 5, flava, in aestivatione valde imbricata, 

 obovata, oblonga vel oblongo-lanceoliita usque lanceolata, inferne sensim angustata vel + longe 

 unguiculata, apice obtusiuscula vel acutiuscnla vel acuta usque acuminata, 1,2 — 2,2 cm longa, 

 0,4 — 0,7 cm lata, basi 0,2 — 0,3 cm lata, apice parce ac tenuiter pilosula, ceternm giabra. 

 Squamae petaloideae plerumque 5, petalis saepissime simillimae, sed bis paullo breviores ac 

 usque ad dimidium angustiores (raro dimidio fere breviores ac apice antberiferae vel rarissime 



