CONZATTIA A NEW GENUS OF CAESALPINTACEAE. 
By J. N. Rose. 
ry 
While collecting on the dry limestone hills west of Tehuacan, Mex- 
ico, in 1905, with Mr. Jos. H. Painter, I found a very curious legu- 
minous tree which much resembles an Acacia in habit and foliage. 
It was long past flowering time and most of the pods were deformed 
or abortive, due to the sting of some insect, but a few unripe ones 
were found to which a stamen or two still clung, showing the rela- 
tionship to be not with Acacia but with the Caesalpiniaceae. This 
material was brought to Washington and carefully examined, but 
could not be identified. In 1906, a little later in the season, I again 
visited Tehuacan and succeeded in gathering mature seeds, but still 
no flowers. Later in the same year Prof. C. Conzatti sent me speci- 
mens with immature pods, which he had obtained in June, and, finally, 
in 1907. he sent me flowers collected by him on May 12 of that year. 
Upon this material, together with a photograph showing the habit 
and also a seedling now growing in Washington, I am able to present 
a full diagnosis of this tree. It proves to be a very distinct genns, 
perhaps nearest Cercidium, but never thorny, and differing from it 
decidedly in other respects, especially in foliage and fruit. It gives 
me great pleasure to name it for my good friend, Prof. C. Conzatti, 
director de la Escuela Normal in the city of Oaxaca, Mexico, author 
of “Los Generos Vegetales Mexicanos,” and a most painstaking 
botanical collector. He has on several occasions assisted me in my 
field work, as he has also many other naturalists, and has contributed 
many valuable specimens to the National Herbarium. 
Conzattia Rose, gen. nov. 
Calyx tube campanulate, very short. much shorter than the lobes; lobes 
valvate, becoming reflexed, subequal; petals 5, yellow, equal, distinct; stamens 
10, erect: filaments glabrous except at the base, here hairy; ovary (in all 
specimens seen apparently abortive) white-woolly;: legume strongly flattened, 
few-seeded, dehiscent, the seeds oblong, albuminous; cotyledons oblong, entire. 
Tree or large shrub, usually with a very distinct trunk and a broadly spreading 
top. Leaves large, twice-pinnate (seedling leaves onece-pinnate) with many 
pinne and leaflets, Stipules minute. Flowers yellow, in slender racemes. 
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