GENERA OF THE OLACACE^E. 129 



growing out of a napiform root often bearing edible oblong tubers. 

 The stems are charged with alternate lanceolate leaves ; and the 

 inflorescence is terminal on a simple peduncle, bearing several 

 alternately approximate flowers. 



Arjona, Cav. Char, emendatus. 



Flores hermaphroditic Caly cuius brevissime stipitatus, imo cupulatus, 

 margine exteriore in lamellam lanceolatam erectam produetus, utrinque 

 pilosulus. Calyx isti ins it us, paulo brevior, 2-sepalus; sepala di- 

 stincta, lineari-acuminata, subfalcata, lateraliter opposita, suberecta, 

 utrinque pilosa. Corolla longe tubulosa ; tubus tenuis, incurvus, ad 

 nervos 5 angulatus, imo ad ovarium breviter connatus, faucem versus 

 ampliatus, intus sub segment a lituris totidem linearibus niveis squa- 

 mulis minutis crebre pennatis instructis; segmenta 5, acute triangu- 

 laria, recurvatim expansa, intus glabra. Stamina 5, fauce inclusa, 

 segmentis opposita ; filament a tenuissima, antheris dimidio breviora ; 

 anther & 2-lobae, ad medium dorsi affixse, lobis sublinearibus, sine con- 

 nective, lateraliter adnatis, antice dehiscentibus, fuliginosis ; pollen 

 minuturn, flavura. Discus epigynus, subconvexus, glandulis 5 radiatim 

 prominentibus persistentibus coronatus. Stylus filiformis,longissimus, 

 stamina attingens; stigmata 3, parva, acuta. Ovarium* pyriforme, 

 subpentagonum, viride, ad basin tubi corollae adglutinatum, supra 

 1-loculare, infra pro majore parte 3-loculare dissepimentis tenuissimis 

 e placenta filiformi centrali productis ; ovula 3, apice placentae sus- 

 pensa, imo in quoque loculo. Fructus ovatus, subparvus, glandulis 5 

 persistentibus coronatus ; pericardium fuscum, tenue; nux conformis, 

 lutea, coriaeea, abortu 1-locularis et monosperma; semen suspensum, 

 nucem implens; integumenta nulla; albumen album, carnosum, pres- 

 sione placentae latere sulcatum; embryo centralis; radicula supera, 

 teres ; cotyledones 2, multoties breviores. 



Herbae vel fruticuli humiles Americce meridionalis ; radix fusiformis, 

 fibrillis scepe tuberiferis munita ; caules plurimi, suberecti, scepe 

 subramosi ; folia alterna, rarius ternatim congesta, linearia, erecto- 

 divergentia. Flores in capitulum terminate spicato-aggregati. 



1. Arjona tubekosa, Cav. (non alior.) Icon. iv. pp. 57, 58, 

 tab. 383 ; Lam. Diet. Suppl. i. 451, tab. 921 ; A. DC. Prodr. xiv. 

 627 (excl. synon.). — Quinchamala patagonica, Spr. Syst. i. 537. 

 Fretum Magalhaen, ad portum Deseado (Nee): non vidi. 



The typical plant upon which Cavanilles founded this genus 

 was collected by Louis Nee in 1789, in his voyage round the world 



* In A. rigida mihi visum et ex vivo pictum ; in A. tuberosa, Cav., ut videtur 

 subsimile ; in reliquis spociebus 6 ad hue incognitum, ged analogice forsan cum 

 •tructura identica. 



