LOC.  “Common on the rich alluvial flats of the Murray and Darling.”  D. Sturt.

OBS.  This plant is, perhaps, not specifically distinct from S. Greyana Lindl.  Bot.  Regist. 1846, tab. 66, of which the figure is a good representation of S. grandiflora in every respect, except in the form and proportions of the teeth of the calyx and lateral bracteae.  In these points it exactly agrees with complete specimens, for which I am indebted to Mrs. Grey, from the banks of the Murray, and Mr. Eyre’s station (Moorundi), about 98 miles from Adelaide, where it was first found in November, 1841.  The following characters, if constant, will sufficiently distinguish it from S. grandiflora.

Swainsona (Greyana) suffruticosa pubescens, foliis 5-9-jugis inexpansis incano-tomentosis; foliolis oblongis obtusis retusisve:  adultis semiglabratis:  rachi subincana, racemis multifloris folio longioribus, bracteis lateralibus lanceato-linearibus brevioribus tubo calycis albo-lanati quinque-dentati:  dentibus obtusiusculis tubo dimidio brevioribus, vexillo bicalloso.

In the second edition of Hortus Kewensis, (vol. 4. p. 326), I excluded from the generic character of Swainsona the calli of the vexillum, having observed two Australian species where they were wanting, but which in every other respect appeared to me referable to this genus; for the same reason I continue to introduce the calli, where they exist, into the specific characters, as was done in Hortus Kewensis, 1. c.  In the generic character of Swainsona, given in De Candolle’s Prodromus, (vol. 2. p. 271), the calli of vexillum are transferred to the calyx; this can only be regarded as an oversight, which perhaps has been corrected by the author himself, and which, so far as I know, has never been adopted in any more recent work in which the generic character of Swainsona is given.

8.  Swainsona? (laxa) glabra, caule ramoso, foliis 6-7-jugis; foliolis oblongo-ovalibus obtusis, racemis elongatis laxis, pedicellis calyce glabro quinquedentato brevioribus, bracteolis subulatis, vexillo ecalloso.

LOC.  Statio nulla indicata, in Herb.  D. Sturt.

OBS.  There is something in the aspect of this plant not entirely agreeing with the other species of the genus; and as the fruit is unknown, and the flowers yellow, I refer it with a doubt to Swainsona.

PENTADYNAMIS.

Char.  Gen.—­Calyx 5-fidus subaequalis.  Vexillum explanatum, callo baseos laminae 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.