18 Ign. Ui'ban, 



j^. Folia breviter petiolata, long. : lat. =11/2 — 2:1. Petala 6 — 10 mm longa, 

 unguieuli limbo 2 — 2' '.j-plo longiores superne conglutinati 



3. P. nitidus Wats. 

 b. Folia margine levoluto crenata. Inflorescenüae secundiflorae. Petala libera lineaiia. 

 Filamenta 2 antica fertilia, caetera ananthera 4. P. crenatus Gray. 



1. Petalouyx Thiirberi Gray, foliis sessilibus, forma et magnitudine variis, 

 ovato-acnminatis v. oblougo-laneeolatis v. anguste laneeolatis, basi obtusissimis trun- 

 eatis V. obsolete eordatis, apice aeutis v. acutiuseulis, 1 — 2,5 em loogis, 3 — 14 mm latis, 

 2 — 4-plo longioribus quam latioribus, margine piano integris v. saepius inferne plus 

 minus serratis; infloreseentiis demum spiciformi-elongatis vagis, pedunculis special. 

 0,2 — 0,7 mm longis, braeteis e basi saepe cordata ovato - aeuminatis ad et plerumque 

 sub medio paree dentatis v. serratis, demum emarcidis et stramineis, prophyllis ambitu 

 ovato -laneeolatis oblongis v. laneeolatis pinnatifido-erenatis; calycis tubo ovato v. 

 subanguste ovali. lobis suberectis; petalis 4 — 5 mm longis, marginibus unguiculi superne 

 membranaeeo-dilatatis et inter sese conglutinatis, limbis paullo usque dimidio brevioribus 

 ovatis V. ovalibus; staminibus omnibus fertilibus, antheris 4-loeellatis. 



Tabula I. Fig. 27 — 32. Fig. 27. Petala 2 conglutinata estrinsecus. 28. Pars 



styli suprema. 29. Fructus. 30. Semen. 31. Embryo. 32. Diagramma (petalis in ala- 



bastro visis conglutinatis). 



Fetalonyx Thiirberi A Gray PI. Thurh. in Mem. Ämer. Acad. V (1854) 319; 

 Walp. Ann. V. 5; Torr. Mex. Bound. 67 t. 22 ex Wats. Bibl. Ind. I. 391; Brew. et 

 Wats. Bot. Call f. I. 238; Urb. in Ber. Deutsch. Bot. Ges. X. T. XIV f. 5 (Diagr.); Co- 

 ville in Contr. U. St. Nat. Herb. IV. p. 107. 



Fruticulus usque 60 cm altus ramosissimus. Gaules vetustiores usque 7 mm crassi 

 pallide flavescentes v. albescentes hinc inde rimosi, hornotini virides v. subvirides teretes ob- 

 solete V. manifestius striati, pilis brevibus v. brevissimis patentibus v. plerumque plus minus 

 deorsum curvatis antrorsum scabridis densissime obsiti, gemmis serialibus nullis. Folia crebra 

 sessilia forma et magnitudine varia ovato-acuminata v. oblongo-lanceolata v. anguste lanceolata, 

 basi obtusissima, truncata v. obsolete cordata, apice acuta v. acutiuscula, 1 — 2,5 cm longa, 

 3 — 14 mm lata, 2 — 4-plo longiora quam latiora, integra v. margine infero plus minus serrata, 

 rigida, utrinque pilis brevissimis superne attenuatis minutissime scabridis valde exasperata; folia 

 ramulorum duplo et ultra minora, subito v. sensim in bracteas subaequales abeuntia. Racemi 

 in apice caulis ramorumque initio capituliformes, demum usque 4 cm longe spiciformi-elongati 

 plus minus laxiusculi, axi pilis longioribus magis patentibus albidisque villosiusculo; bracteae 

 e basi saepe cordata ovato - acumiuatae obtusiusculae v. obtusae ad et plerumque sub medio 

 parce dentata v. serrata, sub anthesi pallide v. flavido-virides, densissime et brevissime patenti- 

 hirtellae, 4 — 6 mm longae, 3 — 4 mm latae, demum emarcidae et stramineae; pedunculi 

 0,2 — 0,7 mm longi; propbylla ambitu ovato-lanceolata oblonga v. lanceolata 2 — 3 mm longa, 

 0,8 — 1,4 mm lata, pinnatifido- crenata; pedicelli nuUi. Flores 5-, raro 4-meri. Galycis 

 tubus ovatus v. subanguste ovalis, 1,3 — 1,7 mm longus, 0,8 — 1 mm crassus sub apice con- 

 strictus, nunc pilis apice attenuatis nunc truncatis brevibus obtectus; lobi suberecti 

 1,5 — 2,5 mm longi, vix 0,5 mm lati, tubo calycis aequilongi v. paullo longiores obsolete 

 nervulosi, extrinsecus et ad marginem pilis antrorsum scabridis patentibus obsiti, postremo 

 decidui. Petala „albida", 4 — 5 mm longa, lobos calycinos ultra duplo superantia, extrinsecus 



