1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



209 



floral distinctions can be found between these two taxa, and they are, therefore, 

 considered only as varieties differing" in vegetative characters. 



4. Henriquezia longisepala Bremekamp, Act. Bot. Neerl. 6 : 376. 1957. 

 Distribution. Amazonian Brazil. 



Known only from the state of Amazonas, Rio Negro, Sao Felipe, Igara pe 

 Touri, 27 Sep 1952, Froes 28781 (holotype U, isotype IAN). 



Hillia Jacq. Enum. PI. Carib. 3. 1760. 



Hillia maguirei Steyermark, sp. nov. Fig. 73, A-D. 



Frutex 2-3-metralis, omnino glaber, ramulis fusco-purpureis superne saepe 

 exfoliantibus subquadrangularibus ; stipulis deciduis eis basin florum sub- 

 tendentibus submembranaceis late oblongis vel ovato-oblongis apice rotundatis 

 17-21 mm longis 6.5-8 mm latis; foliis breviter petiolatis, petiolis crassiusculis 

 2-5 mm longis ; laminis coriaceis ovato- vel oblongo-ellipticis apice abrupte 

 acuminatis basi acutis vel subacutis 5-8 cm longis 2.5-3.5 cm latis, costa media 

 subtus subprominenti, nervis lateralibus utroque latere obscuris 2-3 adscendenti- 

 bus fere rectis, nervulis obsoletis ; floribus terminalibus solitariis sessilibus stipulis 

 duabus involucratis ; bracteis basin florum suffultis 4, duabus exterioribus ovatis 

 abrupte acuminatis basi costa media prominenti 5-6 mm longis 3.5-4 mm latis, 

 duabus interioribus brevioribus oblongis apice rotundatis cucullatis breviter 

 notatis 3-3.5 mm longis 2.2-2.5 mm latis; hypanthio late oblongo apice truncato 

 repando-ruguloso 6.5 mm longo 4 mm lato costulato ; calyce nullo, 6 cicatricibus 

 solum inter apicem hypanthii et basin ovarii expositis; corolla alba longe hypo- 

 crateriformi ad faucem paullo dilatato, tubo 11-12 cm longo basi 5-5.5 mm lato 

 fauce 7-10 mm lata, lobis 6 linearibus vel lanceolato-linearibus apice obtusis 

 3.5-4.5 cm longis 6-8 mm latis ; staminibus 6, antheris inclusis sessilibus linearibus 

 apice rotimdato-truiicatis 8 mm longis 1.5 mm latis; stylo glabro 11.5 cm longo, 

 stigmatibus bilobatis papillosis; capsulis cylindricis apice truncatis 7.5 cm longis 

 7.5-8 mm latis glabris ; seminibus non visis. 



VENEZUELA. Amazonas: Serrania Yutaje, Rio Manapiare ; infrequent 

 among boulders on hillsides ; shrub 2-3 m high ; flowers white, fragrant ; pods 

 dehiscent down on side; seeds comose with long brown hair; alt. 1750 m; 17-19 

 Feb 1953, B. Maguire & C. K. Maguire 35287 (holotype NY); same locality; 

 infrequent in intervals; alt. 1800 m; 17-19 Feb 1953, B. & C. K. Maguire 35296 

 (paratype NY). 



This showy-flowered species resembles the widespread H. parasitica Jacq. ? 

 which also occurs in the Venezuelan Guayana Highlands on the slopes and 

 summits of some of the sandstone table-mountains. From H. parasitica it may 

 be distinguished by the lack of calyx-lobes, which are instead represented by 6 

 scars, by the longer corolla-lobes, broader corolla-tube, nearly subsessile to more 

 shortly petiolate leaves, which are gradually narrowed to an acute base with a 

 much shorter petiole and less abruptly long-acuminate apex, by the shrub and 

 terrestrial instead of epiphytic or climbing habit (the latter condition frequent 

 in the West Indian specimens of H. parasitica), and by the loose, often exfoliating 

 epidermis of the purple-brown younger branches, as contrasted with the tight 

 gray epidermis of the branches of H. parasitica. 



From H. tubiflora Cham. [H. illustris (Veil) K. Sch.] it may be distinguished 

 by the longer corolla-tube and lobes, absence of calyx, fewer pairs of lateral 



