Orobanche. 55 



nia! (Farallone city, San Mateo county, August 1909; W. A. Setchell in Plants of Cali- 

 fornia distrib. by the Herb, of the univ. of California Berkeley, n. 173 unter 0, comosa 

 Hook.!, Santa Cruz). (Siehe Karte 61 in: Die Pflanzenreale, 1. Reihe, Heft 7.) 



Nota. 0. Qrayana proxima est 0. califomicae, sepalis modo brevioribus et antheris 

 lanuginosis distinguitur (confer Beck, Monogr. Orob. 80 et A. Gray in Torrey, Botany of the 

 exped. of 35. parall. [1857] 62). Secundum colores corollarum varie descriptas discrimina vix 

 detrahenda sunt. 



6. 0. Ludoviciana Nuttall, Gen. North Amer. pl. II. (1818) 58; G. Beck, Monogr. 

 Orob. (1890) 80, 1. 1, fig. 5. — Caulis brevis, crassus, basi vix vel rarius clavato-incras- 

 satus, rarissime crassissimus, glanduloso-pilosus vel glabrescens, parce squamatus, 4 — 

 20 cm altus, simplex, ramulosus vel ramosus. Squamae ovales, breves, vix 1 cm longae. 

 Spica simplex vel e basi ramosa cum ramis brevibus, apice rotundata, densi- et multi- 

 flora. Flores magni, 20 — 26 mm longi, sessiles vel inferi breviter pedicellati, pedi- 

 cellis floribus brevioribus. Bracteae ovali-lanceolatae, sicut bracteolae lanceolatae calyce 

 breviores. Calyx basi scutelliformis, profunde 5-dentatus, dentibus lineari-lanceolatis, 

 copiose glanduloso-pilosis, saepe longitudine inaequalibus, dimidium tubi corollini longi- 

 tudine aequantibus vel paulo longioribus. Corolla modice pronus curvata, supra sta- 

 minum insertionem paulo constricta, versus faucem bilabiatam sensim ampliata, extus 

 breviter glanduloso-pilosa, purpurascens, intus obscurior, rarius lutescens; labium supe- 

 rum bilobum, lobis ellipticis, rotundatis vel acutis, interdum emarginatis, iis labii inferi 

 oblongo-ellipticis saepe acuminatis, paulo deflexis, omnibus in sinubus parce et breviter 

 pilosis; pili articulati, verrucosuli. Filamenta oblique 5 — 8 mm supra basim tubi in- 

 serta, infra modice incrassata et pilosa vel sicut in parte superiore glabra; antherae 

 mucronatae, lanuginosae, demum glabrescentes, siccae albidae; cellulae endothecii an- 

 therarum incrassatae, aporosae; pollen 20 — 25 fi. Germen ellipsoideum ; placentae in 

 quoque carpello 2, in extremis suis conjunctae vel ad unam connatae; Stylus glaber; 

 stigma disciforme, in medio infundibuliformiter excavatum, irregulariter 2 — 4-lobum, 

 cum lobis verruculosis. Capsula matura plus minus profunde bivalvis, 12 mm longa, 

 calyce brevior-longior, valvis saepe apice emarginatis. Semina ellipsoidea, 0,45 — 0,5 mm 

 longa; cellulae testae dense reticulato-porosae, hinc inde ad hilum etiam poris amplis 

 instructae. — Fig. \\K—N. 



Var. a. genuina G. Beck, Monogr. Orob. (1890) 81 = O. Ludoviciana Nuttall, 

 1. c; Hook. Fl. bor. amer. II. 92; Rydberg, Fl. of the Blackhills of South Dakota, in Contr. 

 Un. Stat. nat. herb. III. (1896) 518; Britton and Brown, Illustr. Fl. North. Un. Stat. III. 

 (1898) 196; V. Piper, Fl. Washington, in Contr., 1. c. XI. (1896) 522; Gray, New Man. 

 of bot. ed. 7, by Robinson and Fernald (1908) 740. — Phelipaea Ludoviciana G. Don, 

 Gen. syst. IV. (1838) 632, sec. Gray, Manual bot. ed. 5 (1868) 323. — Phelipaea Lu- 

 doviciana Walpers, Repert. III. (1844 — 1845) 461; Reuter in DC. Prodr. XI. 11. — 

 Aphyllon Ludovicianum Gray, Bot. California I. (1876) 585; Synopt. Fl. II. (1878) 313; 

 Hemsley et Salvin, Biolog. centr. amer. bot. II. (1882) 468; J. M. Coulter, Bot. of west. 

 Texas, in Contr., 1. c. II. (1892) 316. — Myzorrhiza Ludoviciana (Nutt.) Rydberg in 

 Small, Fl. Southeast. Un. Stat. (1903) 1093, et Stud. of the Rocky mount. fl., in Bull. 

 Torr. bot. club. XXXIII. (1906) 151; Wooton and Standley, Fl. New Mexico, in Contr. 

 Un. Stat. Nat. Herb. XIX. (1915) 600. — Aphyllon arenosum Suksdorf in Allg. bot. 

 Zeitschr. XII. (1906) 27 (confer notam). — Flores sessiles, dense spicati, vix 20 mm longi. 

 Antherae subglabrae. Calycis dentes lanceolati, dense pilosi. Caulis basi paulo vel vix 

 incrassatus. 



Plantae nutrices. Artemisia frigida W. (sec. Porter et Coulter), A. tri- 

 dmtata Nutt. et Psoralea verrucosa W '. (sec. Geyer); Ambrosia trifida L. (fide J. Schrenk 

 in Bot. Gaz. XXV. [1898] 57); Solanum spec. et Erigeron spec. (fide H. Garman, The 

 broom-rapes [Orobanche], in Bull. Kentucky agric. exp. stat. n. 105, 1903). 



Nordamerika. In den westlichen und südwestlichen Staaten vornehmlich an 

 trockenen, mergeligen und tonigen Ufern: Vancouver Islands-Saskatchewan (Maple 

 bahk, August 1880 fJ. Macoun], nach V. Piper bis 52° n. Br.); California; Arizona; 



