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Pentadynamis.

CHAR. GEN.—Calyx 5-fidus subæqualis. Vexillum explanatum, callo baseos laminæ in unguem decurrenti. Carina obtusa, basin versus gibba, longitudine alarum. Stamina diadelpha; antheris 5 majoribus linearibus, reliquis ovatis. Ovarium polyspermum. Stylus e basi arcuata porrectus, postice barbatus. Legumen compressum.

Herba (Suffrutex sec. D. Sturt), bipedalis sericeo-incana; caule angulato erecto. Folia ternata; foliolis sessilibus, linearibus, obtusis. Flores racemosi, flavi.

9. PENTADYNAMIS incana.

LOC. “On sand-hills with Crotalaria Sturtii.” D. Sturt.

DESC. Herba erecta, ramosa, sericeo-incana. Folia alterna, ternata; petiolo elongato, teretiusculo, foliolo terminali longiore vix unciali. Racemi multiflori, erecti; pedicelli subæquantes calycem. Bracteolæ subulatæ, infra apicem pedicelli, basin calycis attingentes. Calyx 5-fidus; laciniis acutis tubum æquantibus. Corolla flava, calyce plus duplo longior. Vexillum explanatum, basi absque auriculis sed callo in unguem decurrenti ibique barbato auctum. Carina infra medium gibba


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pro receptione baseos styli. Staminum antheræ majores lineares, basi vel juxta basin affixæ; 5 minores ovatæ, incumbentes. Ovarium lineare, pubescens. Stigma terminale, obtusum. Legumen immaturum incanum, stylo e basi arcuata porrecto terminatum, calyce subemarcido subtensum.

OBS. In the collection of the plants of his last expedition, presented to the British Museum by Sir Thomas Mitchell, there is a plant which seems to belong to the genus Pentadynamis, which is probably, therefore, one of the species of Vigna, described by Mr. Bentham.

10. CASSIA (Sturtii), tomentoso-incana, foliis 4-jugis foliolis lanceolato-linearibus planis: glandula depressa inter par infimum, racemo corymboso paucifloro cum pedunculo suo folium paulo superante v. æquante, calyce tomentoso.

LOC. “In sandy brushes of the Western interior.” D. Sturt.

OBS. Species proxima C. artemisiæfoliæ De Cand. Prodr. quæ Cassia glaucescens Cunningh. MSS. 1817, cui foliola teretiuscula, et racemus corymbosus cum pedunculo suo folio brevior.

11. CASSIA (canaliculata), cinerascens pube tenuissima, foliis 2-jugis (raro 1-jugis) foliolis angustato-linearibus canaliculatis: glandula inter par inferius et dum unijuga inter terminale, calycibus glabriusculis, racemis corymbosis paucifloris folio brevioribus.

LOC. “In the bed of the creeks of the Barrier Range, about thirty-six miles from the Darling, in lat. 32° S.” D. Sturt.

OBS. Proxima C. eremophilæ Cunningh. MSS. quæ sequentibus notis a Cassia phyllodinea et C. zygophylla, Benth. facile distinguenda.

CASSIA (eremophila), glabra, foliis unijugis rarò passim bijugis;


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foliolis linearibus canaliculatis latitudine racheos linearis aversæ, corymbis paucifloris folio brevioribus.

LOC. In desertis prope fluvium Lachlan, anno 1817, detexit. D. Cunningham.

CASSIA (zygophylla), glabra foliis unijugis; foliolis linearibus planis rachi duplo latioribus, corymbis paucifloris folio brevioribus.

Cassia zygophylla, Benth. in Mitch. trop. Austr. p. 288.

Another species nearly related to C. zygophylla is readily distinguished by the following character.

CASSIA (platypoda), glabra, foliis unijugis; foliolis linearibus apiculo recurvo duplo angustioribus rachi aversa lanceolato-lineari.

LOC. Juxta fluvium Murray, anno 1841, detexit Domina Grey.

12. CASSIA (phyllodinea), canescens pube arctissimè adpressa, phyllodiis aphyllis linearibus planis falcatis aversis, calycibus glabris, legumine plano-compresso.

LOC. In Herbario D. Sturt specimen exstat nulla stationis aut loci indicatione, sed eandem speciem ad fundum sinus Spencer's gulf dicti in sterilibus apricis anno 1802 legi.

DESC. Frutex quadripedalis, ramosissimus. Phyllodia semper aphylla, aversa, linearia, acuta, basi attenuata, plus minusvè falcato-incurva, biuncialia, ? circiter unciæ lata, exstipulata, paginis pube arctissime adpressa canescentibus, margine superiore glandula unica depressa obsoleta. Flores flavi, in umbella axillari 2-3 flora.

OBS. Cassia phyllodinea is one of the very few species of the genus, which, like the far greater part of New Holland Acaciæ lose their compound leaves, and are reduced to the footstalk, or phyllodium, as it is then called, and which generally becomes foliaceous by vertical


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compression and dilatation. A manifest vertical compression takes place in this species of Cassia.

A second species, Cassia circinata of Benth. in Mitch. trop. Austr. p. 384, is equally reduced to its footstalk, but which is without manifest vertical compression. To this species may perhaps be referred Cassia linearis of Cunningham MS., discovered by him in 1817, but which appears to differ in having a single prominent gland about the middle of its phyllodium: Bentham's plant being entirely eglandular.

These two, or possibly three species, belong to the desert tracts of the South Australian interior. In the same regions we have another tribe of Cassiæ closely allied to the aphyllous species; they have only one pair of foliola which are caducous, and whose persistent footstalk is more or less vertically compressed. Along with these, and nearly related to them, are found several species of Cassia, having from two to four or five pairs of foliola which are narrow, but their footstalks are without vertical compression, and their foliola are caducous, chiefly in those, however, which have only two pairs.

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