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Crossosomataceae
Crossosoma californicum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Crossosomatales
Family:	Crossosomataceae Engl.
Genera
Apacheria Crossosoma Glossopetalon Velascoa

Crossosomataceae is a small plant family, consisting of four genera of shrubs found only in the dry parts of the American southwest and Mexico. This family has included up to ten species in the past, although as of 2021 six species are still recognised. Crossosoma are shrub-like plants which can vary from being 50 cm to 5 meters tall, with small alternating leaves that surround the stem, or leaves clustered in small spurts (fascicles). Apacheria, however, has opposite leaves. Crossosoma has usually white flowers that are generally bisexual and have 5 petals attached to a nectary disk, but in Velascoa the flowers are campanulate and have an extremely reduced nectary disk.

Genera

• Apacheria - one species, cliff brittlebush, Apacheria chiricahuensis
• Crossosoma - two species, C. bigelovii and C. californicum. C. bigelovii var. parviflora or C. parviflora was described for plants from the northern side of the Grand Canyon with a disjunct population in Sonora, with slightly smaller flowers than C. bigelovii, but it is not recognised as distinct even at a varietal level by the Flora of North America in the 2015 volume.
• Glossopetalon - two (or four species)
• Velascoa - one species

References

1. Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. hdl:10654/18083.
2. Christenhusz, M. J. M. & Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
3. ^ Calderon, Graciela; Rzedowski, Jerzy (1997). "Velascoa (Crossosomataceae), un género nuevo de la Sierra Madre Oriental de México" [Velascoa (Crossosomataceae), a new genus from the Sierra Madre Oriental of Mexico] (PDF). Acta Botanica Mexicana (in Spanish). 39 (39): 53–59. doi:10.21829/abm39.1997.776.
4. ^ Mason, Charles T. Jr.; Yatskievych, George (15 January 2015). "Crossosoma bigelovii". Flora of North America north of Mexico. Vol. 9: Magnoliophyta: Picramniaceae. Flora of North America Editorial Committee. ISBN 9780195340297.
5. ^ Mason, Charles T. Jr.; Yatskievych, George (15 January 2015). "Glossopetalon". Flora of North America north of Mexico. Vol. 9: Magnoliophyta: Picramniaceae. Flora of North America Editorial Committee. ISBN 9780195340297.
6. ^ Allen, Maya L.; Ayers, Tina (25 October 2021). "A Revised Classification of Glossopetalon (Crossosomataceae) Based on Restriction Site-Associated DNA Sequencing". Systematic Botany. 46 (3): 562–572. doi:10.1600/036364421X16312067913417. S2CID 240155253.
7. ^ Richardson, P. (1970). Morphology of the Crossosomataceae. I. Leaf, Stem and Node. Bulletin of the Torrey Botanical Club, 97(1), 34-39. doi:10.2307/2483988

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