AUG. 1899. STUDIES IN THE HERBARIUM. I. ULINE. 421 



Culebras Island, south shores, MILLSPAUGH, PI. Utowanae, 

 Armour Exped. no. 607. Type in Field Col. Mus. Herb. cat. 

 no. 60607. 



Nearer A. (TelantJierd) Sintenisii Urban /. c. than the preced- 

 ing, but the pubescence on the leaf of the latter is described as 

 "supra laxius subtus densius pilosis," upon which rests the chief 

 difference of the above species. It may prove to be only a 

 variety a question which only a comparison of the two plants 

 can decide. 



Alternanthera Lorentzii Uline, n. sp. 



(A. Achyrantha Moq. ? /. c. 358, non R. Br.) 



Prostrata caulibus crassis, ad nodos radiculas gerentibus, gla- 

 bris (nisi junioribus parce pilosis) ; foliis crassis, glabris rotun- 

 datis vel obovatis, apice rotundatis mucronulatis ; capitulis 

 spinosis majusculis, 2 5-nis in axillis foliorum, bracteis acumi- 

 natissimis, sepalum interiore aequantibus, sepalis exteroribus 2 

 divergentibus, longissime aristatis, lateralia interioreque multo 

 superantibus; tubo stamineali brevissimo, staminodiis perbrevi- 

 bus 2-3-dentatis, filamentis fertilibus, gracilibus, staminodia 

 multo superantibus. 



Cau/es 2 2.5 mm. diametro, internodiis 2 6 cm. longis. 

 Folia 1.5 2.5 cm. longa, breviter petiolata. Capitula ovata, 

 usque i cm. longa. Sepala 2 exteriora longissime aristata, glabra, 

 5 mm. longa demum devaricata; interiore lanceolato-acumina- 

 tum, 3 mm. longum, glabrum; lateralia 2 minora 2.5 mm. longa, 

 angustiora, valde plicato-carinata, dorso pilosa, pilis glochidiatis 

 barbatisque. 



Uruguay, Concepcion del Uruguay, LORENTZ in 1878. Type 

 in Field Col. Mus. Herb. cat. no. 54626. 



The question arises as to what is really known about R. Brown's 

 A. Achyrantha. If the evidence of scores of herbaria is good, it 

 is quite safe to accept those Alternantheras having short simple 

 staminodia equaling the filaments, so generally distributed over 

 North and South America from South Carolina to Brazil, as the 

 correct interpretation. But this comparatively well-known plant 

 differs radically from the above-described Lorentz plant, as fol- 

 lows : leaves and head smaller, sepals all more or less provided 

 with the glochidiate barbed hairs above described, but the two 

 dorsal exterior ones not conspicuously aristate ; staminodia sim- 

 ple, very short, equaling the filaments. Since Moquin-Tandon 

 seems to have mixed the description of a similar plant to the 



