Psychotria adenophora Steyerm.
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Authority
Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
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Family
Rubiaceae
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Scientific Name
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Type
Type. On diagonal ledge on face of upper escarpment, Cerro Huachamacari, Río Cunucunuma, Amazonas, Venezuela, alt 1300-1600 m, 5 Dec 1950, Bassett Maguire, Richard Cowan & John Wurdack 29851 (holotype NY). Paratype. VENEZUELA. Amazonas: Cerro Sipapo (Paraque), in montane forest between Intermediate Camp and summit, alt 600-1500 m, 6 Feb 1949, Maguire & Politi 28808.
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Description
Latin Diagnosis - Planta subherbacea, ramis glabris; stipulis in vaginam 2 mm longam 3 mm latam glabram connatis, in dentes duos lineari-lanceolatos acutos 1.8-3 mm longos desinentibus; foliis oppositis petiolatis, petiolis 1-1.5 cm longis glabris; laminis ovatis vel elliptico-ovatis apice acuminatis basi abrupte acutis vel subacutis 10-16 × 3.5-7 cm subtus costa media nervis lateralibus venulisque glabris vel pilosulis ceterum ubique glabris subtus pustulatis, nervis lateralibus utroque 8-13 rosacea-rubris conspicuis adscendentibus ubique elevatis ante marginem 2-5 mm manifeste anasto-mosantibus, venulis tertiariis laxe reticulatis inconspicuis; inflorescentia terminali subglobosa capitata submonocephala vix ramosa 0.6-0.8 cm longa 1-1.5 cm lata, axibus principalibus duobus vel quattuor; pedunculo tenui 2.8-3.3 cm longo glabro; bracteis extremis duobus sub basi axium infimorum inflorescentiae suborbicular!-deltoideis apice obtusis vel rotundatis basi rotundatis ampliatisque latioribus quam latioribus 5.5 mm longis 6.5 mm latis glabris e basi vel supra basin nervis sex orientibus tenuiter venulosis, intus basi duo paria glandularum duorum vel trium munitis, bracteis interioribus suborbicularibus apice rotundatis 3.5 mm longis 4 mm latis glabris intus basi duo paria glandularum duorum vel trium; bracteis interioribus sex sub fasciculis florium 5-8; hypanthio obconico glabro; calyce 5-lobato, lobis ovatis vel suborbicularibus obtusis vel rotundatis glabris inter lobos basi sinus uni-glanduliferis, glandulis conspicuis 0.5-0.7 mm longis; disco tubo calycis breviore; corollis non visis; bacca ovoideo-oblonga 5 × 3 mm glabra, pyrenis facie ventrali longitudinaliter sulcatis dorso 5-costatis.
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Discussion
This taxon is related to P. contracta M.-Arg., from which it differs in the glabrous involucral bracts with roseate nerves, glandular within at base, and prominent intercalycine appendages.
The infructescences have two or four main axes. Two main axes may be branched into 3-parted units, each of which is provided with a central solitary flower on either side of which are 2-3 flowers borne on the lateral axes, or each of the four main axes may have 8 flowers each with a larger bract of a pair of bracts subtending 11 other smaller bracts, some of which subtend the flowers.