You can publish a new species even if it hasn't flowered, as long as you provide comprehensive documentation. It's essential to include detailed morphological data from other plant parts (like leaves, stems, and roots) that can distinguish it from known species. Incorporating genetic analysis, if possible, will strengthen your case for the new species designation. Additionally, providing habitat and ecological information can further support your findings. Collaborating with experts in taxonomy can also help ensure that your documentation meets the necessary standards for publication.