Maybe this is the link you are looking for? Library made by 454 shotgun sequence.

http://www.ncbi.nlm.nih.gov/sra/?term=Cleome%20spinosa

The Cleome hassleriana genome is available here:

http://www.ncbi.nlm.nih.gov/assembly/GCA_000463585.1

And the Cleome violacea genome is availbale here:

http://genome.jgi.doe.gov/pages/projectStatus.jsf?db=ClevioStandDraft

There are qite a lot of RNA-seq experiments deposited at the SRA for C.gynandra and just one for C. spinosa (the one linked in the message above), but no genome as far as I can see.

Cleome hassleriana genome (Scaffolds)

http://www.ncbi.nlm.nih.gov/nuccore?term=KE705278:KE706419[PACC]

This takes you to the scaffolds page, the earlier reply will lead you to the assembly page for the same sequences.

However, you may want to check this publication before using the assembly

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3784582/#!po=64.8936

Like Marco replied, mostly transcriptome data is available for C.spinosa and link shared by Maurits

The persons to ask are Professor Andreas Weber or Dr. Andrea Bräutigamm from University of Düsseldorf. 

You can find Cleome hassleriana (now Tarenaya hassleriana) genome and gene models on the CoGe website: 

https://genomevolution.org/CoGe/OrganismView.pl?oid=38500

Thanks Prof. Eric. I was able to get it as you suggested.