Dendrobium. 289 



Subg. X. Rhizobium. 



Rhizobium Lindl. in Journ. Lina. Soc. HF. (1859) 2 (sectio Dendrobii)\ Benth. 

 Fl. austral. VI. (1873) 276 et 284 et seq.; Pfitzer in Engl.-Prantl, Pfizfam. II. 6. (1888) 

 175. — Monophyllaea ßenth. 1. c. 276 et 2 82. — Garnifolia Reichb. f. in Walp. 

 Ann. VI. (1861) 282; Benth. et Hook. f. Gen. III. 499. 



Sympodia ramosissima; caules internodio unico constituti, monophylli; folia semper 

 carnosa aut teretia, canaliculata aut ellipsoidea, plana aut transsectione rotundata, plus 

 minus verrucosa. Flores in racemis 1-v. paucifloris dispositi, labellis quam maxime 

 crispulis, undulatis sinuosisve eximii. — Omnes Australienses. 



Clavis specierum subgeneris Rhizobii. 



A. Folia brevia, crassa, planiuscula v. transsectione rotunda. 



a. Labellum simplex, crassum, obovatum. Folia subglobosa. 561. D. Uchenastrum. 



b. Labellum trilobum. 



ct. Folia fusiformia, seriebus 8 — 9 papillarum obsita . . 562. D. cucumerinum. 

 ß. Folia oblonga v. ellipsoidea non papulosa. 



I. Lobus intermedius labelli oblongus, acutus, fere 



ad apicem trilamellatus. Folia utrinque trisulcata. 56 3. D. Hnguiforme. 

 II. Lobus intermedius triangulus, carinae 3 in disco 



mox evanidae. Folia brevi-petiolata, pungentia . . 564. D. pugioniforme. 



III. Lobus intermedius obcordatus, carina mediana lon- 



gior, totus discus papillosus. Folia oblonga acuta 565. D. rigidum. 



IV. Lobus intermedius obovatus, discus non papillosus. 



Folia lanceolata S65a.D.desmotrichoides. 



B. Folia elongata, teretia, supra sulcata. 



a. Labellum simplex. 



ct. Labellum articulatum, in hypochilium oblongum et epi- 



chilium cordatum triangulum divisum 566. D. chordiforme. 



ß. Labellum e basi apicem usque continuum. 



I. Labellum lanceolatum. 



1. Labellum apice helicoideo-incurvum, calli 3 per 



discum antice in lamellas undulatas aucti. . . 567. D. teretifolium. 



2. Labellum apice crenulatum crispatum, carinae 2, 



in basi et apice confluentes, minore interposita 568. D. crispatum. 



II. Labellum cuneatum. 



1 . Calli labelli in apice labelli confluentes ; pedicelli 



uniflori 569. D. Beckleri. 



2. Calli labelli antice non confluentes; pedicelli bi- 



flori 570. D. Mortii. 



b. Labellum manifeste trilobum. 



Lobi laterales trianguli, intermedius triangulus reflexus 



undulato-sinuosus. (Planta parva, minima sectionis.) . 571. D. striolatum. 



561. D. Uchenastrum F. Müll. Fragm. Phyt. VII. (1869) 60. — Bulbophyllum 

 Lichenastrum F. Müll. 1. c. ; Benth. Fl. austral. VI. 2 87; Bailey, Queensl. Fl. Pt. V. 

 (1902) 1537. — Dense caespitificum. Rhizoma repens , crassum, multiarticulatum, 

 rainosum, internodia brevia, unifoliata et uniflora, vix 8 mm longa. Folia crassa, carnosa, 

 (tibicularia v. subrhombea, ad 10 mm longa, 8 mm lata. Racemi vix conspicui, 1-flori. 

 Sepalum dorsale late ovatum (orbiculare?), lateralia triangula, acuta, apice paulum reflexa, 

 mentum bene rolundatum formantia, petala lineari-lanceolata , acuta, multo angusliora. 

 Labellum ex ungue angusto canaliculato, subito in laminam reflexarn, oblongam, subpandu- 

 ratam, obtusam, supra rugulosam dilatatum. Gynostemium perbreve, pollinia 4. — Totus 

 flos hyalinus, 4 mm diam. omnes partes 2 — 3 mm longae. 



A. Engl er, Das Pflanzenreich. IV. (Embryophyta siphonogama) 50. 19 



