Monographia Loasaceanim. 65 



superne 3 — 3.5 mm crassus, pilis brevibus brunneis verticillatim glochidiatis densissime ob- 

 tectus, alils antrovsum spinuligeris rarius intermixtis, snpra ovarium 1,5 — 2,5 mm productus ac 

 cnpuliformi-ampliatus; lobi in aestivatione inferne quincuncialiter late sibi imbricati superne 

 aperti, alabastrum ovato-oblongum, longe acuminatum formantes, ovato-lanceolati usque lan- 

 ceolati, longissime acnminati, 1,3 — 1,5 cm longi, basi 0,4 — 0,5 cm lati, in fructu persistentes 

 emarcidi brunneo-nigrescentes, refiexi. Petala 5 in aestivatione valde imbricata, obovata vel 

 obovato-oblonga, ad basin versus sensim angustata et cum staminibus in annulum connata, 

 breviter apiculata, 2,2 — 2,5 cm longa, 1,1 — 1,4 cm lata, supra basin 2 — 3 mm lata, apice bre- 

 vissime ac tenuissime puberula, ceterum glabra. Squamae petaloideae nullae. Filamenta 

 40 — 60, 2 — 3-seriata, 10 exteriora 1,6 — 1,9 cm longa, linearia, er. 1 — 1,8 mm lata, cetera 

 filiformia, er. 1 — 1,2 cm longa, omnia basi cum petalis in annulum connata, glabra; antherae 

 staminum 10 exteriorum oblongae, 1,3 — 1,6 mm longae, 0,8— 0,!» mm latae, ceterae ovales vel 

 ovali-rotundatae, er. 0,8 — 0,9 mm longae, fere item latae, omnia apice vix, basi manifeste 

 emarginatae, basi inter crura affixae, lateraliter dehiscentes, dettoratae non contortae. Discus 

 glaber. Stylus postremo 1,5— 1,7 cm longus, filiformis, glaber, angulatus, e lamellis 3 con- 

 tlatus, intns fistulosus, apice papillosus, in fructu persistens emarcidus apice dextrorsum con- 

 tortus, lamellis a medio saepissime secedentibus. Capsula conica, inferne sensim attenuata, 

 stipitata sed stipite brevissimo, brunnea vel brunneo-nigrescens, scaberrima, subchartacea, 

 1,6 — 2 cm longa, apice er. 4 — 5 mm crassa, cal.yce emarcido nigrescente semper reflexo per- 

 sistente styloqne coronata, intra lobos calycinos 3-valvis, valvis triangulari-semiorbicularibus 

 incrassatis cum placentis alternantibus; placentae 3 latissimae inter vallis nitentibus glabris 

 duplo triplove latiores irregulariter plicatae rugosaeque ac manifeste prominentes. Semina 

 6 — 10 in placentis 1 — 2-seriata, pendula, funiculis nullis vel subnullis, irregulariter ovata vel 

 ovato-oblonga (forma embryonis) brunneo-grisea, irregulariter sed manifeste striata ac dense 

 verrncoso-tuberculata, exalata, 2,5 — 3 mm longa, 1,7 — 2 mm lata, medio 1,1 — 1,2 mm crassa; 

 endospermium perpaucum vel subnuUum. Embryo rectus; cotyledones subquadratae rotundatae, 

 pauUo latiores quam longiores, subito in radiculam paullo breviorem triploque angustiorem 

 acutiusculam subcylindraceam contractae. 



Habitat in Mexico: herb. WilldenovF u. 10158 fol. 2 et 3, (non 1, quod Mentselia 

 scaira H.B.K.), Allaman (a. 1832), Uhde n. 1073, Asehenborn n. 99, Schaffner n. 639, Pavon, 

 Hartweg n. 16 p. p. (cum Mentzelia imbricata Urb. et Gilg), in valle Sante Fe prope 

 Mexico: Bourgeau n. 295, in monte Zacoalco prope Guadalupe in valle prope Mexico: 

 Bourgeau n. 295 p. p. (cum Mentzelia gradlis Urb. et Gilg), in valle prope Mexico: 

 Schmitz, Berlandier n. 654, Chapultepec: Knechtein. 757, Bio Blanco in civitate Jalisco: 

 Palmer n. 600, Guanaxnato: Herb. De Candolle, circa Toluca: Heller n. 375, Exotihuacan: 

 Hahn, circa Mexico: Wawra n. 302, prope San Louis Potosi: Schaffner n. 558, in montibus 

 St. Eulaliae in civitate Chihuahua: Pringle n. 616, prope urbem Durango: Palmer 

 n. 484 et 485. 



Floret mense Jun. — Sept. — V. s. in herb. Berol., Boissier-Barbey, Candolle, De- 

 lessert, Holm., Kew., Martii, Monac., Paris, bort. Petropolit., J. D. Smitli , Vindobon., 

 Willdenow. 



Obs. Species valde variabilis, sed characteribus ad varietates condendas idoneis de- 

 ficientibus. 



28. Mentzelia Karwiuskii Urb. et Gilg (n. sp.) foliis ovatis, omnibus distinctissime 

 petiolatis; petalis 3 — 3,2 cm longis; filamentis HO — 120, distinctissime inaequalibus, 



Nova Acla LXSVI. Nr. 1. 9 



