Eremocaulon (Londono & Clark, 2002)

Jesus-Costa, Cristielle De, Clark, Lynn G., Santos-Gonçalves, Ana Paula & Londoño, Ximena, 2018, Eremocaulon triramis (Poaceae: Bambusoideae: Bambuseae: Guaduinae): a new species from the Atlantic rainforest of the State of Espírito Santo, Brazil, Phytotaxa 375 (1), pp. 104-112 : 111

Key to the Species of Eremocaulon

1. Culms 0.2–0.5 cm in diameter; branch complement with 3 subequal branches; foliage leaves with fimbriae fused (resembling a laminar structure) on the summit of the underlapping sheath margin; pseudospikelets with subtending bracts laminiferous; stamens 4 ........................................................................................................................................................................ Eremocaulon triramis

- Culms 1–5 cm in diameter; branch complement with one dominant branch bearing 2–12 secondary branchlets; foliage leaves with fimbriae free on the summit of the underlapping sheath margin; pseudospikelets with subtending bracts lacking a lamina; stamens 6..........................................................................................................................................................................................................2

2. Pseudospikelets solitary or in open clusters along the main axis ; pseudospikelets 1–2 (3) per coflorescence, glabrous, slender, 5–20 cm long; ovary glabrous; Bahia and Minas Gerais, Brazil.................................................................................................................3

- Pseudospikelet clusters along the main axis congested to capitate; pseudospikelets (3) 5–15 per coflorescence, pilose to glabrous, stout, 1–2.5 cm long; ovary basally glabrous, apically hispid; central and western Amazonian Brazil............................................4

3. Culms hollow, 2.5–5 cm in diameter, pubescent and white-green to yellowish when young; culm leaf sheath abaxially pubescent; rachilla internodes between the fertile florets pilose............................................................................................ E. aureofimbriatum

- Culms solid, ca. 1 cm in diameter, smooth and shiny, blue-green when young; culm leaf sheath abaxially glabrous; rachilla internodes between the fertile florets glabrous......................................................................................................... E. asymmetricum

4. Culms 1.5–3.5 (–4) cm in diameter, (4.5–) 6–12 m tall; culm leaf sheaths abaxially glabrescent; midrib of the foliage leaf blade noticeably excentric; lemma and enfolded margins of the palea glabrous; rachilla internodes between the fertile florets pubescent and straight; central Brazil............................................................................ E. capitatum ( Trinius 1835: 626) Londoño (2002: 714)

- Culms 1–3 cm in diameter, 3–6 m tall; culm leaf sheaths abaxially pubescent; midrib of the foliage leaf blade only slightly excentric; lemma and enfolded margins of the palea pilose; rachilla internodes between the fertile florets pilose and flexuous; western Amazonian Brazil........................................................................................................ E. amazonicum Londoño (2002: 716)