146 
PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 64, No. 7 
August. Leaves are not present on plants collected in January-March. According to information on 
Kruse 2701-b, leaves were taken from the same individual from which fruits and flowers were col¬ 
lected at other times. 
This species can be distinguished from L. brevicalyx A. Richardson, which also occurs in dry 
forests of western Mexico, by characters in the following couplet: 
Calyx 10-14 mm long, 3-lobed or 5-lobed with 3 large lobes and 2 reduced lobes, 3 large lobes 
lanceolate to ovate, 8-11 mm long; capsule pubescent with straight, eglandular trichomes 
0.2-0.5 mm long; Michoacan. L. brevicalyx 
Calyx 5-9 mm long, 3-lobed (reduced lobes absent), lobes broadly ovate to triangular, 3.5-6.5 mm 
long; capsule pubescent with glandular trichomes to 0.1 mm long (lacking straight, eglandular 
trichomes); Guerrero. L. rzedowskianum 
Poikilacanthus foliosepalus T.F. Daniel, sp. nov. 
Poikilacanthus foliosepalus differs from its congeners by the following combination of char¬ 
acters: short and few-flowered dichasiate spikes in leaf axils, elliptic calyx lobes 10-11 mm long 
and 2.7-5 mm wide, red corollas 39-49 mm long that are externally pubescent with eglandular tri¬ 
chomes only, and four-aperturate pollen covered with densely spaced but mostly discrete insulae. 
Type. — MEXICO. Oaxaca: Distr. Tlacolula, Mpio. Mitla, Tierra de Santo Pie de Cerro, 
16°55’24.3”N, 96°24’21”W, 1673 m, selva baja caducifolia, 29-VII-2009 (fir), H. Hernandez O. 
326 (holotype: MEXU!; isotypes: CAS!, SERO!). 
Perennial herb to shrub to 8 dm tall; young stems subquadrate and 4-sulcate, evenly pubescent 
with erect to flexuose eglandular trichomes 0.2-0.9 mm long. Leaves ascending to appressed, peti- 
olate, petioles to 5 mm long, blades ovate to elliptic (to obovate), 17-38 mm long, 11.5-22 mm 
wide, 1.2-1.7 x longer than wide, emarginated to rounded to acute at apex, cuneate at base, sur¬ 
faces and margin pubescent with cauline type trichomes (although sometimes antrorse) and with 
trichomes denser on abaxial surface, major veins yellowish and prominent, margin entire. Inflo¬ 
rescence of short dichasiate spikes in axils of leaves; spikes pedunculate, few-flowered, peduncles 
2-A mm long, pubescent like young stems, rachis evenly pubescent with erect to flexuose eglan¬ 
dular trichomes 0.05-0.1 mm long; dichasia alternate (1 per node), 1-flowered, sessile. Bracts ses¬ 
sile, subfoliose, broadly elliptic to subcircular, 7-10.5 mm long, 4-8 mm wide, rounded at apex, 
abaxial surface pubescent like leaves. Bracteoles narrowly elliptic to oblanceolate, 3 4.5 mm long, 
0.6-0.8 mm wide, abaxial surface pubescent like bracts. Flowers subsessile (i.e., borne on pedicels 
to 1.5 mm long), mostly 2 per spike. Calyx 5-lobed, 12-13 mm long, lobes elliptic, 10-11 mm long, 
2.7-5 mm wide, acuminate-subcaudate at apex, abaxial surface ± prominently 3-5-veined, pubes¬ 
cent with flexuose to appressed eglandular trichomes 0.05-0.3 mm long or nearly glabrous distal- 
ly, margin conspicuously ciliate with flexuose eglandular trichomes to 1 mm long. Corolla red, 
39—49 mm long, externally pubescent with flexuose eglandular trichomes 0.1-0.4 mm long, tube 
only very gradually and ± inconspicuously expanded distally (throat ± indistinct), 23-28 mm long, 
narrow proximal portion 18-20 mm long, 3-3.2 mm in diameter near midpoint, throat 4-10 mm 
long, upper lip 15-21 mm long, 2-fid at apex, lower lip 16-21 mm long, lobes 6-8 mm long, 
3.5-4 mm wide. Stamens 17-18 mm long, filaments glabrous distally, thecae parallel, subequally 
inserted, 3.5-4 mm long, subequal in length, glabrous, with a rounded basal appendage 0.1-0.2 mm 
long (lower theca with a larger appendage than distal theca); pollen subprolate to euprolate, 4-aper- 
turate (see discussion), polar diameter 52-55 pm, equatorial diameter 38-43 pm, insulae densely 
spaced but mostly discrete (rarely 2 sharing a common wall). Style 33—42 mm long, stigma 0.2 mm 
long, lobes not evident. Capsule and seed not seen. 
