1953} 



REVISION OF BRACHYOTUM 



401 



Type Photographs and Illustrations: Gleason 28-2 and F 16713 (destroyed syn- 

 type at B); Fl. Peruv. & Chil. 3: pi. 319, f. a (1802) (as Rhexia lutescens, with 

 5-merous flowers however). 



Distribution: Dept. Huanuco, Peru, alt. 1800-3100 m. 



Near Mito, Macbride & Featherstone 1871 p.p. (A p.p., F p.p.), Macbride & Feather- 

 stone 1872 (F, G-DEL, NY, S); "Yanano," Macbride 4927 (F, NY, US). 



Of the 61 examinable flowers in the various collections of B. lutescens , 55 

 were 4-merous, and only 6 5~merous. 



That only 2 morphologic "Urpflanzen" are involved between B. lutescens and 

 B. rosmarini folium seems evident from the limited series of available specimens; 

 one, represented by B. lutescens , is glandular-pubescent on all external surfaces 

 of stems, leaves, hypanthia, and calyces, the pubescence patent, the flowers 4- 

 merous with the connective not prolonged ventrally; the other, represented by B. 

 rosmarini folium, is completely eglandular on these surfaces, the pubescence 

 strictly appressed, and the flowers 5 - merous with a prominently prolonged con- 

 nective. Various combinations of these characters have segregated, apparently 

 permanently in the wide-ranging B. rostratum. Macbride & Featherstone 1870, 

 1871, and 1872, from one locality, seem to represent a hybrid swarm between the 

 two "Urspecies," with 1872 being "pure" B. lutescens. One sprig of 1870 (G- 

 DEL), not included in the specific description of B. lutescens, has eglandular 

 leaf trichomes and 4-merous flowers with only a few gland-tipped hypanthial hairs, 

 but otherwise this number is a mixture of 5~merous elements; one 5~merous sprig 

 of this number (F) has the leaves of B. rosmarinifolium, but large patent gland- 

 tipped hypanthial hairs. Unfortunately there are no label notes on this puzzling 

 series, and the populations (?), if originally collected separately, have been in- 

 discriminately mixed in the specimens distributed to various herbaria. 



44. Brachyotum angustifolium Wurdack, sp» nov. 



Hypanthii et laminarum superficiei inferae trichomata basi sparse minuteque 

 muricata ceterarum partium laevia. Ramuli novelli obscure quadrangulati, cum 

 petiolis pedunculis pedicellisque dense iongo-strigulosi. Petiolus 1-4 mm. La- 

 mina 7-17 x 1.5-3.5 mm. anguste oblonga apice basique obtusa, nervis primariis 

 3 supra impressis subtus expressis, secundariis obsoletis; supra tuberculis 5" 

 7/mm. 2 in series 6 regulariter dispositis dense onusta, tuberculo basi 0.3-0.5 mm. 

 diam. abrupte setifero seta appressa 0.1-0.3 mm. longa; subtus densissime strigu- 

 losa 30-40/mm. 2 Flores 5-meri saepe terni; dichasii pedunculus gracilis 10-20 x 

 0.5 mm., bracteolis ad basim dichasii 4-6 x 0.5-0.7 mm. linearibus vel leviter 

 spathulatis valde (ante anthesim) caducis supra glabris vel apicem versus strigu- 

 losis subtus modice strigulosis. Pedicellus sub bracteolis 0.5-2 mm., super 5-8 

 mm.; pedicelli bracteolae 2-5 x 0.2-0.7 mm. lineares uninerviae valde caducae 

 supra glabrae subtus sparse strigulosae. Hypanthium 4-5 x 3.5-4.5 mm. triangu- 

 laria vel ovato-triangularia apice acuta basi per 0.5-0.7 ram. cohaerentia sinu late 

 acuto. Petala 10-11 x 6-7 mm. asymmetrice obovata apice oblique truncata, ciliis 

 glanduliferis 0.1-0.7 mm. Filamenta 5-5.5 mm.; antherae 4.5"5 mm.; connectivum 

 basi antherae nec producto nec libero. Stylus 20 x 0.6 mm., per 7 mm. exsertus. 

 Ovarium 4-5 x 2 .5—3 mm. apice per 2-2.5 mm. modice longo-strigulosum setis pro 

 parte glandulosis, lobis apicalibus super loculos 0.2-0.4 mm. 



Type Collection and Locality: Mathews 1253 (HOLOTYPE K); Peru, Dept. 

 Amazonas, "Bajasan, Prov. Chachapoyas, 1835." 



Type Photograph: Gleason 27-11 (Weberbauer 4426, destroyed paratype at B). 



Distribution: Dept. Amazonas, Peru, alt. 3000-3300 m. 



Chachapoyas, Weberbauer 4426 (BR); without locality (but probably from Chachapoyas), 

 Mathews 1231 (BR). 



