168 ON SOUTH-AMEEICAN APOCYNACHJ:. 



4. Pkestoniopsis Fendleri^ nob. : Dipladenia Fendleri, Miill. Linn. xxx. 417. In Venezuela, Tovar 

 (Fendler 1030) : non vidi. 



A species near the two preceding. It is a subscandent shrub, with glabrous verrucose 

 branches, the younger ones puberulous ; leaves broadly ovate or elliptic, cordate at the 

 base, shortly cuspidate at the apex, glabrous above, with 6-8 pairs of divergent nerves 

 and reticulated veins, incano-tomentous beneath, 2f-4J in. long, 1^3 in. broad, on 

 petioles f— If in. long ; raceme lateral or subterminal, on a peduncle 2 in. long, bearing 

 a head of densely aggregated, small, pubescent flowers, on pedicels 5-7 Mnes long, sup- 

 ported by narrow Hnear-lanceolate bracts of the same length ; sepals linear-lanceolate, 

 imbricate, pubescent, 3J lines long, each with a basal 2-3fid scale ; corolla not yet ex- 

 panded, nearly 1 in. long ; tube pubescent, contracted near the base, where it is stamini- 

 gerous, pubescent in the mouth ; segments rather narrow, elongate, with ciliated mar- 

 gias. If line broad ; disk 2 ovate lobes, half as long as the 2 ovaries. 



Anisolgbtjs. 



A genus established by DeOandoUe in 1844. Its chief distinctive character (whence 

 its name) is a large calyx of 5 unequal, oblong, obtuse, erect, membranaceous sepals, 

 quincuncially imbricate, the 2 outer ones being smaller. Miiller, regardless of this 

 prominent feature, described and figured some of its species as belonging to Odontadenia, 

 a genus with which he was evidently unacquainted. This mistake was afterwards copied 

 by the authors of the ' Genera Plantarum ' (ii. 723), who, without sufficient reflection, 

 absorbed Anisolobus into Odontadenia ; the latter is a genus widely remote, with which 

 Anisolobtis can claim no affinity whatever. It was founded by Mr. Bentham, in 1841, 

 upon very sound data. 



The generic character of Anisolobus is here remodelled from the careful analysis of those 

 species which I have been able to examine. 



Anisolobus, A. DC. : Miill. (in parte). Calyx majusctiliis. Sepala 5, valde insequalia, quorum 2 exte- 

 riora minora, quincuncialiter et insigniter imbricata, oblonga, obtusa, membranacea, imo crassiora, 

 intus squamulis 2 bidentatis singulatim munita. Corolla tubulosa ; tubus longiusculus, infra medium 

 angustatus, superne infundibuliformis ; segmenta falcatim dolabriformia, in sestivatione pro tertia 

 parte ereeta, angulo sinistro acutata, dehinc subito introflexa, intra tubum descendentia, apicibus 

 antheras attingentes, demum expansa et dextrorsum convoluta. Stamina 5, ad constrictionem 

 tubi inserta, inclusa; filamenta subbrevia, linearia, membranacea; antherce anguste lineares, cus- 

 pidatae, imo in furcas 2 longiusculas fissse. Discus urceolatus, margine denticulatus, ovaria saepius 

 occultans. Ovaria 2, oblonga ; stylus tenuis ; clavuncula incrassata, pentagone eylindrica, glandu- 

 losa, ad antheras conglutinata, imo indusiata ; stigmata 2, parva, oblonga, terminalia. Folliculi 2, 

 oblongi, crassiusculi, fusiformes, horizontaliter divergentes, glabri vel pubescentes, sutura ventrali 

 dehiscentes ; semina plurima, linearia, coma sericea 3-4plo longiore coronata. 



Sufirutices America meridionalis, seepius scandentes ; rami ad nodos stipulacei ; folia opposita, ob- 

 longa, breviter petiolata ; racemi tJcZ paniculse later ales aut terminates, sape geminati; ^ores pedicellati 

 et bracteolati. 



