THE PHANEROGAMS OF THE JUAN FERNARDEZ ISLANDS 



195 



Male plant: Head 8 mm high, 10 — 12, rarely as much as 15 mm across. 

 Involucre of about 13 scales, 6 — 7 X 4 — 4,5 mm, campanulate, with 5 or 6 small 

 calycular bracts. Ray florets 8, pure yellow, 8—10 mm long; ligule tridentate, 

 3,2 — 4X 2,5 mm; style hardly exserted, bifid; pappus rays numerous (25 — 30) 

 in all kinds of flowers. Disc florets greenish yellow, 6 — j mm long; style deeply 

 bifid with truncate branches. 



Female plant: Head about 10 mm high, 7 — 8 across; involucre cylindrical, 

 7 — 8 X S mm; ray florets 8, yellow, 7 — 8 mm long; ligule 2,5 X 2 mm; style 

 greenish, deeply bifid; disc florets 6 mm long, yellow with greenish, barely 

 exserted style. Young achenes slightly costate with pilose costae. 



Area of distribution: Endemic in Masatierra. 



*I29. R. Masafuerae nov. spec. — Plate 17, fig i; text fig. 33 p — s, 

 34 a, 35 c, k, i. 



Arbuscula dioeca ad 2 m alta, trunco primario certe ad 7 cm crasso, pseudo- 

 dichotome-subumbellatim ramosa, ramis junioribus viridibus, cicatricibus lineari- 

 bus foliorum manifeste notatis. Folia ad 

 apicem ramorum more generis conferta, cras- 

 siuscula.subcoriacea, dilute viridia, glaberrima, 

 lanceolata — anguste obovato-lanceolata, in 

 apicem acutum sensim angustata, versus basin 

 valde contracta, margine in parte dimidia 

 superiore minute denticulata, nervo mediano 

 utrinque conspicuo, basi latissimo, secun- 

 dariis indistinctis, angulo acuto exeuntibus, 

 plerumque 7 — 12 cm longa et 1,5 — 2 cm lata, 

 sed magnitudo summopere variabilis (folia 

 ad 18,3 X 4,7 cm visa, in specimine sylvicola 

 unico invento ad 22 X 3,5 cm). Inflorescentia 

 terminalis valde ramosa corymbosa, bracteis 

 sat parvis instructa; pedicelli capitulorum 

 1 — 2 cm longi, superne pilosi. Capitula J 1 



7 mm alta et 10 mm crassa; involucrum 

 campanulatum, 5 mm altum et 4 mm latum, 

 addito calyculo a bracteis perpaucis angustis 

 ad 2 mm Longis formato. Squamae circ. 12, 

 5 mm longae et 1,5 mm latae, glabrae vel 

 dorso pilis nonnullis inspersae, apice penicil- 

 latae, crassae, margine scariosae, liberae sed 

 manifeste imbricatae. Flores ligulati 8, flavi, 



8 mm longi, ligula 3—3.5 X 2 mm, irregula- 

 riter tridentata, in tubum abrupte angustata, 

 stylo breviter bifido paulo exserto. Flores 

 disci 6 mm longi, viridi-lutei, antheris flavis; stylus inclusus apice bifidus ramis 

 truncatis penicillatis. Pappus multiradiatus. Capitula $ magis numerosa certe 

 ad 75, 8 mm alta et 7 mm lata; involucrum cylindrico-campanulatum, sub apice 

 constrictum, basi truncatum et pilosiusculum, 6—7 mm altum basi 4—5 mm 



Fig. 34. Leaves of a Robinsonia Masa- 

 fuerae, b R. evenia. Nat. size. 



