296 GENUS ATRIPLEX. 



mucronulate at summit, 0.5 to 2.5 cm. long, 0.3 to 1 cm. wide, acutely dentate to repand- 

 dentate or the upper ones entire, densely white-scurfy beneath, greenish-gray on the 

 upper surface ; staminate spikes commonly shorter than the upper leaves and reduced to 

 1 or 2 glomerules each but varying up to 2 cm. long and subpaniculate (especially in 

 minor variation 14, A. pueblensis Standley) ; fruiting bracts 2.5 to 3 or rarely 3.5 mm. long 

 (exclusive of stipe-like base when this is present), 2.5 to 4 mm. broad, each of the sides 

 with 2 dentate crests or smooth (especially in minor variation 9, A. glomerata Watson), 

 1- or 3-nerved, not obviously reticulated; seed 0.8 to 1.2 mm. long. {A. muricata Hum- 

 boldt and Bonpland in Willdenow, Sp. PI. 4:959, 1806.) Apparently throughout 

 Mexico, except in the extreme south and southeast ; known from Pueblo to Coahuila and 

 Sonora. Type locality, Mexico. Collections: Near Tehuacan, Puebla, Pringle 8577 

 (UC, US, type collection of A. pueblensis Standley, minor variation 14); Mexico City, 

 Pringle 8528 (Gr, NY, UC, US) ; San Luis Potosi, Schaffner 287 (NY, US) ; near the City 

 of Durango, Palmer 295 (Gr); vicinity of Saltillo, Coahuila, Palmer 290 (Gr, NY, UC, 

 US); "States of Coahuila and Nuevo Leon," Palmer 1156 (Gr, US, type collection of 

 A. glomerata Watson, minor variation 9); Guaymas, Sonora, Palmer 119 (US, doubtful). 



MINOR VARIATIONS AND SYNONYMS. 



1. Atriplex aldamae Grisebach, Cat. PI. Cub. 282, 1866. — A form of A. pentandra typica in which the 

 fruiting bracts are exceptionally large (4 to 5 mm. long) and without appendages. Apparently only an occa- 

 sional plant is found, indicating that it may be the result of favorable local conditions. The type came from 

 western Cuba and the form is not known elsewhere. 



2. A. ARENARiA Nuttall, Gen. 1:198, 1818. — A. pentandra arenaria. This is not the same as A. arenaria 

 Woods, Jour. Fl. 317, 1850, which is used in Europe for the plant properly known as A. maritima Hallier. 



3. A. coNFiNis Standley, N. Am. Fl. 21:54, 1916. — .4. pentandra confinis. 



4. A. CRISPA Urban, Symb. Ant. 8:200, 1920. — Based upon Obione crispa, which see. 



5. A. CRISTATA Humboldt and Bonpland, in Willdenow, Sp. PI. 4:959, 1806.— Apparently identical with 

 the earlier Axyris pentandra and therefore the same as Atriplex pentandra typica. 



6. A. CRISTATA var. arenaria Kuntze, Rev. Gen. PI. 546, 1891. — A. pentandra arenaria. 



7. A. CYCLOSTEGiA Standley, 1. c, 58, 1916. — Known from a single immature specimen collected near Her- 

 mosillo, Sonora (Maltby 222, US). Placed next to A. elegans by Standley, but the foliage and bracts indicate 

 that it is close to A. pentandra muricata and perhaps a robust development of this. The leaves are large for 

 the subspecies, the largest ones being 3.5 cm. long by 1.3 cm. wide. The larger and more nearly mature bracts 

 are elliptic in shape, much longer than broad, and therefore not of the elegans type. The largest one is 5 mm. 

 long by 3 mm. broad, including the dentate margins and large terminal tooth. It is this elongated apex that 

 renders the bract, even at this immature stage, exceptionally large for subspecies muricata. Whether these 

 marked vegetative characters are the result of especially favorable conditions under which this particular 

 specimen grew, or whether they are characteristic of all plants of the Sonoran coast, and therefore worthy of 

 taxonomic recognition, may be left for more extensive coOections to determine. 



8. A. DOMiNGENSis Standley, 1. c, 55, 1916. — The same as Obione crispa Moquin, which see in this list. 



9. A. GLOMERATA Watson, in Standley, 1. c, 54, 1916. — A. pentandra muricata but the faces of the fruiting 

 bracts not appendaged. Type locahty, Parras, Coahuila. 



10. A. MUCRONATA Rafinesque, Am. Mo. Mag. 2:176, 1818. — A name only incidentally mentioned where 

 first used. Evidently intended to apply to ^4. arenaria Nuttall (No. 2 of this hst), although A. laciniata Lin- 

 naeus is the name referred to. A more complete discussion is given by Blake (Rhodora 17:84, 1915). 



11. A. MURICATA Humboldt and Bonpland, in Willdenow, Sp. PI. 4:959, 1806. — A. pentandra muricata. 



12. A. PARVIFOLIA Humboldt, Bonpland, and Kunth, Nov. Gen. Sp. 2: 192, 1817. — There is nothing in 

 the original description to indicate that this differs in any essential feature from A. pentandra muricata. Type 

 locality, San Juan del Rio, south central Mexico. 



13. A. PENTANDRA TYPICA. — In One West Indian variation the leaves are smaller, broader in proportion to 

 their length, and with a more copious cinereous scurf than in the typical form. Common leaf-measurements 

 are: 2.5 by 1.2 cm., 2 by 0.7 cm., 1.5 by 0.5 cm. Although grayish in color, the leaves are not so thick or 

 so whitish as in subspecies arenaria and confinis. Both this and the typical form are abundant on many of 

 the West Indian Islands, especially in Porto Rico. Recent collectors look upon them as only trivial and 

 fluctuating variations and probably ecads. The following represent the gray, small-leaved form; Cayo 



