Leptocereus quadricostatus Bello Britton and Rose Contr U S Nat Herb

Cereus quadricostatus Bello, Anal. Soc. Esp. Hist. Nat. 10: 276. 1881.

Plants erect or arching, up to 4 meters high, with numerous lateral, usually elongated branches, often forming thickets; branches dull, dark green, usually 4-ribbed, sometimes 3-ribbed, the ribs thin and low; spines acicular, 1 to 4 cm. long; flowers 4 cm. long, 2 cm. wide at the mouth; outer perianth-segments green; inner perianth-segments greenish white or yellowish white, truncate, the apex lacerate or erose; ovary and flower-tube bearing a few clusters of short spines; style and filaments greenish; fruit subglobose to obovoid, 3 to 5 cm. long, not very spiny, red.

242. 1913.

Type locality: Porto Rico. Distribution: Southwestern Porto Rico.

This plant inhabits hillsides and plains in the dry southwestern part of Porto Rico, sometimes forming dense thickets, penetrable only by the use of the machete; it is known as sebucan

1.— Fruit and quadricostatus.

1.— Fruit and quadricostatus.

Figure 119 is from a photograph taken by Frank E. Lutz at Ensenada, near Guanica, Porto Rico, in 1915; figure 120 shows a fruit collected by Dr. Britton and Dr. Shafer at Guanica in 1913; figure 121 shows a flower from a plant at the same locality.

PUBLISHED SPECIES, PERHAPS OF LEPTOCEREUS. Cereus paniculatus De Candolle, Prodr. 3: 466. 1828.

Cactus paniculatus Lamarck, Encycl. 1: 540. 1783.

This has long been in doubt and is known only from imperfect description and illustration. Lamarck states that it is from Santo Domingo, in a region called cul-de-sac, and is based on Burmann's plate 192 of Plumier. It is apparently a Leptocereus, perhaps L.

weingartianus.

11. EULYCHNIA Philippi, Fl. Atac. 23. i860.

Stout, erect or procumbent and ascending, green cacti, usually with many branches, the branches parallel-ribbed, armed with spines; perianth white to pinkish, withering and persisting on the ovary; flowers single at the areoles, opening during both day and night, short and broad for the group, with an open throat, the tube very short if not wanting altogether; scales on ovary and flower-tube numerous, their axils usually with bristles or long hairs; filaments very short, covering the face of the throat; style short and thick; fruit globular, fleshy, somewhat acid, hardly edible; seeds small, dull black, containing endosperm (according to Mr. Sohrens).

Type species: Eulychnia breviflora Philippi.

This genus as here defined contains 4 species found along the coast and central valleys of the provinces of Aconcagua, Coquimbo, Atacama, Antofagasta, and Tarapaca, Chile.

To this group, treated as a subgenus of Cereus by Mr. Berger, has been referred a number of anomalous species which we place elsewhere; they are similar to this genus in the fact that they have very short flower-tubes, but in habit, fruit, and other characters they are quite distinct. These species will be discussed in this work under other genera.

The genus Eulychnia was first established in i860 by Rudolph Philippi, who based it upon a single species, E. breviflora. In 1864 two other species, E. acida and E. castanea, were described, while the fourth is transferred by us from Cereus.

The plants are usually found on dry hills, and are often associated with other cacti and other desert plants. In many regions they form the dominant feature in the vegetation. At least two species are commonly used for fuel, and one (E. acida) is used for hedge fences.

The generic name is from the Greek, signifying a candlestick.

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