164 ON SOTJTH-AMEEICAN APOCTNACE^. 



HoMALADENiA *j nob. : Dipladenia (in parte) auctorum. Sepala acuta vel longe acuminata^ imbricata, intus 

 squarmilis 2 minimis ad basin munita. Corolla hypocraterif ormis ; tubus tenuiter cylindricus, ad 

 faucem vixlatior; se^mew^arbomboideo-dolabriformiaj triplo breviora, rotata, dextrorsum convoluta. 

 Stamina intra faucem inclusa, sBepe ex annulo niveo-piloso orta ; filamenta pilosa ; anthercB bis duplo 

 longiores, apice acutse, imo breviter cordatse, in conum conniventes. Discus opposite bilobus, lobis 

 anguste oblongis. Ovaria 2, acuta^ bis alterna et pauUo longiora j stylus tenuis ; clavuncula incrassata, 

 5-sulcataj imo membrana peltata indusiata ; stigmata 2, parva, terminalia. Folliculi 2, tenuiter 

 tereteSj subtorulosi, erecto-patentes. Semina plurima^ oblonga, ssepe pilosa; coma dupla^ erecta, pilis 

 inf erioribus duplo longioribus, exterioribus multo brevioribus ; embryonis radicula supera. 



SuflFrutices valde humiles, Brasilienses vel Guianenses : Ta,dixcrassa,dauciformi-tuberosa, apice caulos 

 plurimos emittens ; caulis simplex, smpius tenuissimus, erectus, imo nudiusculus, apicem versus crebre 

 foliosus ; folia opposita, anguste linearia aut lanceolato-oblonga, erecta, imbricata, rarius remotiora, 

 brevissime petiolata ; racemus terminalis, pauciflorus ; flores parvi, rarius mediocres. 



1. HoMALADENiA TENUiFOLiA, uob. : Dipladenia tenuifolia, A. DC. Prodr. viii. 482 : Dipladenia poly morpha, 



var. tenuifolia, MiiU. PL Bras. xxvi. 121 : Echites tenuifolia, MikaUj Flor. Bras. fasc. 3 ; Stadelm. 

 Bot. Zeit. 1841, p. 53. In Brasilia, prov. Rio de Janeiro, Minas Geraes et G-oyaz : v. s. in herb, 

 meo prov. Groyaz (Gardner 3888) . 



A species with an erect filiform stem, 6-9 in. high, bare at its base, sending out a short 

 lateral branchlet ; axils f-1 in. apart ; leaves opposite, narrowly linear, subincurved, 

 acuminate, fleshy, margins revolute, glabrous above, puberulous beneath, 1^2f in. long, 

 barely ^ line broad, on petioles 1 line long ; raceme terminal ; peduncle bearing 4 

 alternate flowers 6-9 lines apart, on pedicels 3-4 lines long, with basal bracteoles 1 line 

 long ; sepals acute, 1 line long ; tube of corolla very slender, 6 lines long, a little swollen 

 at the mouth, within which the stamens are enclosed ; segments obliquely oblong, rotate, 

 3 lines long, 2 lines broad ; the glabrous follicles (which I have not seen) are 4 in. long, 1 

 line broad, scarcely torulose ; seeds 4 lines long ; coma, outer row 6 lines long, inner series 

 12 lines long. 



A drawing of this plant, in flower and in fruit, is shown in Plate XXIV a. 



2. HoMALADENiA LiNARi^FOLiA, nob. : Dipladenia linaricefolia, A. DC. I. c. p. 482. In Brasilia, prov. 



Babia : non vidi. 



A slender stem 4-5 in. high, hirsutely puberulous, throwing out other branchlets from 

 its base ; leaves narrowly liaear, obtuse at the base, acuminate, rigid, with revolute mar- 

 gins, subglabrous, l-lj in. long, f line broad, erect ; terminal peduncle 1-lJ in. long, 

 bearing about 3 flowers, on pedicels scarcely ^ line long ; sepals subulately lanceolate, 

 3 lines long ; tube of corolla 7-8 lines long, very slender, thicker in the mouth, within 

 which the stamens are enclosed, seated on a pilose ring ; segments obliquely oblong, 4 

 lines long, 2-2^ lines broad. 



3. HoMALADENiA PASTORUM, nob. : Dipladenia pastoTum, A. DC. I. c.f. 4!82 i Dipladenia palymorpha, var. 



tenuifolia, Miill. I. c. p. 121 : Echites pastorum, Stadelm. I. c. p. 52 : v. s.in herb, meo Minas Geraes 

 (Claussen 256) . 



A tuberous root, throwing out several slender, puberulous, simple stems, 6 in. high, 



* From ojuaXds (planus), aSijv {glans), from the flat shape of the lobes of the disk. 



